Add -NoReset option to service registration functions (#4641)

Affected functions:
- Register-OpenTelemetryForIIS
- Register-OpenTelemetryForWindowsService
- Unregister-OpenTelemetryForWindowsService

Author: vivainio

script-templates/OpenTelemetry.DotNet.Auto.psm1.template

@@ -522,9 +522,16 @@ function Register-OpenTelemetryForCurrentSession() {
 <#
     .SYNOPSIS
     Setups IIS environment variables to enable automatic instrumentation.
-    Performs IIS reset after registration.
+    Performs IIS reset after registration by default.
+    .PARAMETER NoReset
+    Does not perform IIS reset.
 #>
 function Register-OpenTelemetryForIIS() {
+    param(
+        [Parameter(Mandatory = $false)]
+        [bool]$NoReset = $false
+    )
+
     $installDir = Get-Current-InstallDir
 
     if (-not $installDir) {
@@ -538,7 +545,9 @@ function Register-OpenTelemetryForIIS() {
     Setup-Windows-Service -InstallDir $installDir -WindowsServiceName "W3SVC"
     Setup-Windows-Service -InstallDir $installDir -WindowsServiceName "WAS"
 
-    Reset-IIS
+    if (-not $NoReset) {
+        Reset-IIS
+    }
 }
 
 <#
@@ -549,13 +558,17 @@ function Register-OpenTelemetryForIIS() {
     Actual Windows service name in registry.
     .PARAMETER OTelServiceName
     Specifies OpenTelemetry service name to identify your service.
+    .PARAMETER NoReset
+    Does not perform service restart.
 #>
 function Register-OpenTelemetryForWindowsService() {
     param(
         [Parameter(Mandatory = $true)]
         [string]$WindowsServiceName,
         [Parameter(Mandatory = $true)]
-        [string]$OTelServiceName
+        [string]$OTelServiceName,
+        [Parameter(Mandatory = $false)]
+        [bool]$NoReset = $false
     )
 
     $installDir = Get-Current-InstallDir
@@ -565,7 +578,10 @@ function Register-OpenTelemetryForWindowsService() {
     }
 
     Setup-Windows-Service -InstallDir $installDir -WindowsServiceName $WindowsServiceName -OTelServiceName $OTelServiceName
-    Restart-Service -Name $WindowsServiceName -Force
+    
+    if (-not $NoReset) {
+        Restart-Service -Name $WindowsServiceName -Force
+    }
 }
 
 <#
@@ -624,15 +640,22 @@ function Unregister-OpenTelemetryForIIS() {
     Performs service restart after removal.
     .PARAMETER WindowsServiceName
     Actual Windows service Name in registry.
+    .PARAMETER NoReset
+    Does not perform service restart.
 #>
 function Unregister-OpenTelemetryForWindowsService() {
     param(
         [Parameter(Mandatory = $true)]
-        [string]$WindowsServiceName
+        [string]$WindowsServiceName,
+        [Parameter(Mandatory = $false)]
+        [bool]$NoReset = $false
     )  
 
     Cleanup-Environment-Variables -WindowsServiceName $WindowsServiceName
-    Restart-Service -Name $WindowsServiceName -Force
+    
+    if (-not $NoReset) {
+        Restart-Service -Name $WindowsServiceName -Force
+    }
 }
 
 <#