internal/provider: refactor provider_meta.user_agent to list of strings type

This is done to align the schema with the standard provider.

```console
% make testacc PKG_NAME=internal/aws/ec2 TESTARGS='-run=TestAccAWSEC2VPC_providerMeta'
TF_ACC=1 go test ./internal/aws/ec2 -v -count 1 -parallel 20 -run=TestAccAWSEC2VPC_providerMeta -timeout 180m

--- PASS: TestAccAWSEC2VPC_providerMeta (31.37s)
PASS
ok      github.com/hashicorp/terraform-provider-awscc/internal/aws/ec2  32.268s
```

```console
% make testacc PKG_NAME=internal/aws/logs TESTARGS='-run=TestAccAWSLogsLogGroup_providerMeta'
TF_ACC=1 go test ./internal/aws/logs -v -count 1 -parallel 20 -run=TestAccAWSLogsLogGroup_providerMeta -timeout 180m

--- PASS: TestAccAWSLogsLogGroup_providerMeta (24.17s)
PASS
ok      github.com/hashicorp/terraform-provider-awscc/internal/aws/logs 25.032s
```

Inspecting the CloudTrail event history, we can see the `CreateResource`
event contains the expected User-Agent information appended.

```
"userAgent": "APN/1.0 HashiCorp/1.0 Terraform/1.14.0-beta3 (+https://www.terraform.io) terraform-provider-awscc/dev (+https://registry.terraform.io/providers/hashicorp/awscc) aws-sdk-go-v2/1.41.0 ua/2.1 os/macos lang/go#1.24.11 md/GOOS#darwin md/GOARCH#arm64 api/cloudcontrol#1.29.8 m/n test-module/0.0.1 (test comment) second-test-module/0.0.2 (second test comment)",
```

Once the CloudControl API receives the request, the subsequent
calls made to other AWS services by cloud control will _not_ include the
additional User-Agent details. Instead the `userAgent` field will just
display the following:

```
"userAgent": "cloudformation.amazonaws.com",
```

Author: jar-b

docs/index.md

@@ -246,11 +246,7 @@ terraform {
 
   provider_meta "awscc" {
     user_agent = [
-      {
-        product_name    = "example-demo"
-        product_version = "0.0.1"
-        comment         = "a demo module"
-      },
+      "example-demo/0.0.1 (a demo module)",
     ]
   }
 }

internal/acctest/data.go

@@ -110,16 +110,8 @@ func WithProviderMeta() string {
 terraform {
   provider_meta "awscc" {
     user_agent = [
-      {
-        product_name    = "test-module"
-        product_version = "0.0.1"
-        comment         = "test comment"
-      },
-      {
-        product_name    = "second-test-module"
-        product_version = "0.0.2"
-        comment         = "second test comment"
-      }
+      "test-module/0.0.1 (test comment)",
+      "second-test-module/0.0.2 (second test comment)",
     ]
   }
 }

internal/aws/logs/testdata/LogGroup/providerMeta/main.tf

@@ -1,11 +1,7 @@
 terraform {
   provider_meta "awscc" {
     user_agent = [
-      {
-        product_name    = "example-demo"
-        product_version = "0.0.1"
-        comment         = "a demo module"
-      },
+      "example-demo/0.0.1 (a demo module)",
     ]
   }
 }

internal/aws/logs/testdata/LogGroup/providerMetaWithModule/demo-module/main.tf

@@ -2,11 +2,7 @@ terraform {
   # custom provider_meta which should appear appended to user agent
   provider_meta "awscc" {
     user_agent = [
-      {
-        product_name    = "example-demo"
-        product_version = "0.0.1"
-        comment         = "a demo module"
-      },
+      "example-demo/0.0.1 (a demo module)",
     ]
   }
 }

internal/generic/resource.go

@@ -20,14 +20,12 @@ import (
 	"github.com/hashicorp/terraform-plugin-framework/resource/identityschema"
 	"github.com/hashicorp/terraform-plugin-framework/resource/schema"
 	"github.com/hashicorp/terraform-plugin-framework/tfsdk"
-	"github.com/hashicorp/terraform-plugin-framework/types"
 	"github.com/hashicorp/terraform-plugin-go/tftypes"
 	"github.com/hashicorp/terraform-plugin-log/tflog"
 	ccdiag "github.com/hashicorp/terraform-provider-awscc/internal/errs/diag"
 	"github.com/hashicorp/terraform-provider-awscc/internal/identity"
 	tfcloudcontrol "github.com/hashicorp/terraform-provider-awscc/internal/service/cloudcontrol"
 	"github.com/hashicorp/terraform-provider-awscc/internal/tfresource"
-	inttypes "github.com/hashicorp/terraform-provider-awscc/internal/types"
 )
 
 // ResourceOptionsFunc is a type alias for a resource type functional option.
@@ -370,10 +368,6 @@ var (
 	idAttributePath = path.Root("id")
 )
 
-type providerMetaData struct {
-	UserAgent types.List `tfsdk:"user_agent"`
-}
-
 func (r *genericResource) Metadata(_ context.Context, request resource.MetadataRequest, response *resource.MetadataResponse) {
 	response.TypeName = r.tfTypeName
 
@@ -940,13 +934,11 @@ func (r *genericResource) bootstrapContext(ctx context.Context) context.Context
 func (r *genericResource) bootstrapContextWithProviderMeta(ctx context.Context, providerMeta tfsdk.Config, d *diag.Diagnostics) context.Context {
 	ctx = r.bootstrapContext(ctx)
 
-	var metadata *providerMetaData
-	d.Append(providerMeta.Get(ctx, &metadata)...)
+	var metadata []string
+	d.Append(providerMeta.GetAttribute(ctx, path.Root("user_agent"), &metadata)...)
 
 	if metadata != nil {
-		var uap inttypes.UserAgentProducts
-		d.Append(metadata.UserAgent.ElementsAs(ctx, &uap, false)...)
-		ctx = useragent.Context(ctx, uap.UserAgentProducts())
+		ctx = useragent.Context(ctx, useragent.FromSlice(metadata))
 	}
 
 	return ctx

internal/provider/provider.go

@@ -292,25 +292,10 @@ func (p *ccProvider) Schema(ctx context.Context, request provider.SchemaRequest,
 func (p *ccProvider) MetaSchema(ctx context.Context, req provider.MetaSchemaRequest, resp *provider.MetaSchemaResponse) {
 	resp.Schema = metaschema.Schema{
 		Attributes: map[string]metaschema.Attribute{
-			"user_agent": metaschema.ListNestedAttribute{
-				NestedObject: metaschema.NestedAttributeObject{
-					Attributes: map[string]metaschema.Attribute{
-						"comment": schema.StringAttribute{
-							Description: "Comment describing any additional product details.",
-							Optional:    true,
-						},
-						"product_name": schema.StringAttribute{
-							Description: "Product name.",
-							Required:    true,
-						},
-						"product_version": schema.StringAttribute{
-							Description: "Product version. Optional, and should only be set when `product_name` is set.",
-							Optional:    true,
-						},
-					},
-				},
-				Description: "Product details to append to the User-Agent string sent in all AWS API calls.",
+			"user_agent": schema.ListAttribute{
+				ElementType: types.StringType,
 				Optional:    true,
+				Description: "Product details to append to the User-Agent string sent in all AWS API calls.",
 			},
 		},
 	}

templates/index.md.tmpl

@@ -246,11 +246,7 @@ terraform {
 
   provider_meta "awscc" {
     user_agent = [
-      {
-        product_name    = "example-demo"
-        product_version = "0.0.1"
-        comment         = "a demo module"
-      },
+      "example-demo/0.0.1 (a demo module)",
     ]
   }
 }