Sync eng/common directory with azure-sdk-tools for PR 11353 (#6671)

* Handle tool/directory copy better

* Use /usr/bin/env instead of /bin/env

* Append additional newline

---------

Co-authored-by: Ben Broderick Phillips <bebroder@microsoft.com>

eng/common/mcp/azure-sdk-mcp.ps1

@@ -1,4 +1,4 @@
-#!/bin/env pwsh
+#!/usr/bin/env pwsh
 
 #Requires -Version 7.0
 #Requires -PSEdition Core
@@ -61,11 +61,14 @@ $tempExe = Install-Standalone-Tool `
     -Directory $tempInstallDirectory `
     -Repository $Repository
 
-Copy-Item -Path $tempExe -Destination $toolInstallDirectory -Force
+if (-not (Test-Path $toolInstallDirectory)) {
+    New-Item -ItemType Directory -Path $toolInstallDirectory -Force | Out-Null
+}
 $exeName = Split-Path $tempExe -Leaf
-$exe = Join-Path $toolInstallDirectory $exeName
+$exeDestination = Join-Path $toolInstallDirectory $exeName
+Copy-Item -Path $tempExe -Destination $exeDestination -Force
 
-Write-Host "Package $package is installed at $exe"
+Write-Host "Package $package is installed at $exeDestination"
 if (!$UpdatePathInProfile) {
     Write-Warning "To add the tool to PATH for new shell sessions, re-run with -UpdatePathInProfile to modify the shell profile file."
 } else {
@@ -74,5 +77,5 @@ if (!$UpdatePathInProfile) {
 }
 
 if ($Run) {
-    Start-Process -WorkingDirectory $RunDirectory -FilePath $exe -ArgumentList 'start' -NoNewWindow -Wait
+    Start-Process -WorkingDirectory $RunDirectory -FilePath $exeDestination -ArgumentList 'start' -NoNewWindow -Wait
 }

eng/common/scripts/Helpers/AzSdkTool-Helpers.ps1

@@ -247,6 +247,6 @@ function Add-InstallDirectoryToPathInProfile(
 
     if (!$configContent -or !$configContent.Contains($markerComment)) {
         Write-Host "Adding installation to PATH in shell profile at '$configFile'"
-        Add-Content -Path $configFile -Value $pathCommand
+        Add-Content -Path $configFile -Value ([Environment]::NewLine + $pathCommand)
     }
-}
+}