Merged PR 52734: [release/10.0.1xx-rc1] Use ToLowerInvariant().Contains(...) for .NET Framework

[release/10.0.1xx-rc1] Use ToLowerInvariant().Contains(...) for .NET Framework ([#31354](#31354))

Co-authored-by: Stephane Delcroix <[email protected]>

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#### AI description  (iteration 1)
#### PR Classification
This pull request implements a code cleanup by simplifying case-insensitive string comparisons.

#### PR Summary
The changes update the conditions in the Maui Controls targets file, replacing multiple explicit string comparison overloads with a cleaner approach using ToLowerInvariant().Contains(...).
- `src/Controls/src/Build.Tasks/nuget/buildTransitive/netstandard2.0/Microsoft.Maui.Controls.targets`: Updated conditions for `<_MauiXaml_SG>`, `<_MauiXaml_RT>`, and `<_MauiXaml_XC>` to use ToLowerInvariant().Contains(...) instead of Contains(..., StringComparison.OrdinalIgnoreCase).
<!-- GitOpsUserAgent=GitOps.Apps.Server.pullrequestcopilot -->

Author: mattleibow

src/Controls/src/Build.Tasks/nuget/buildTransitive/netstandard2.0/Microsoft.Maui.Controls.targets

@@ -87,9 +87,9 @@
 	    <_MauiXaml_SG Remove="@(_MauiXaml_SG)" />
 	    <_MauiXaml_RT Remove="@(_MauiXaml_RT)" />
 	    <_MauiXaml_XC Remove="@(_MauiXaml_XC)" />
-	    <_MauiXaml_SG Include="@(MauiXaml)" Condition="$([System.String]::new('%(MauiXaml.Inflator)').Contains('SourceGen', StringComparison.OrdinalIgnoreCase))" />
-	    <_MauiXaml_RT Include="@(MauiXaml)" Condition="$([System.String]::new('%(MauiXaml.Inflator)').Contains('Runtime', StringComparison.OrdinalIgnoreCase))" />
-	    <_MauiXaml_XC Include="@(MauiXaml)" Condition="$([System.String]::new('%(MauiXaml.Inflator)').Contains('XamlC', StringComparison.OrdinalIgnoreCase))" />
+	    <_MauiXaml_SG Include="@(MauiXaml)" Condition="$([System.String]::new('%(MauiXaml.Inflator)').ToLowerInvariant().Contains('sourcegen'))" />
+	    <_MauiXaml_RT Include="@(MauiXaml)" Condition="$([System.String]::new('%(MauiXaml.Inflator)').ToLowerInvariant().Contains('runtime'))" />
+	    <_MauiXaml_XC Include="@(MauiXaml)" Condition="$([System.String]::new('%(MauiXaml.Inflator)').ToLowerInvariant().Contains('xamlc'))" />
       <_MauiXaml_AsEmbeddedResource Include="@(_MauiXaml_RT)" />
       <_MauiXaml_AsEmbeddedResource Include="@(_MauiXaml_XC)" KeepDuplicates="false" />      
 	</ItemGroup>