Fix: Don't change working directory when invoking tsp-client (#53156)

* Initial plan

* Fix: Don't change working directory when invoking tsp-client

Replace Push-Location/Pop-Location with npm --prefix option to avoid changing the working directory before invoking tsp-client. This fixes the issue where tsp-client makes assumptions based on the working directory.

Co-authored-by: JoshLove-msft <[email protected]>

* Use full path to tsp-client binary instead of npm exec

Keep Push-Location for npm ci as required, but execute tsp-client using the full path to the binary. This ensures npm ci runs from the correct directory while tsp-client executes from the current working directory.

Co-authored-by: JoshLove-msft <[email protected]>

* Use npm exec --prefix to invoke tsp-client

Keep Push-Location/Pop-Location for npm ci, then use npm exec --prefix to invoke tsp-client from the current working directory while using the pinned version from tsp-client directory.

Co-authored-by: JoshLove-msft <[email protected]>

---------

Co-authored-by: copilot-swe-agent[bot] <[email protected]>
Co-authored-by: JoshLove-msft <[email protected]>

Author: Copilot

eng/scripts/Invoke-GenerateAndBuildV2.ps1

@@ -140,19 +140,19 @@ if ($relatedTypeSpecProjectFolder) {
                 Write-Error "Failed to install tsp-client dependencies"
                 exit $LASTEXITCODE
             }
-            
-            # Use tsp-client from pinned version by running from tsp-client directory
-            $tspclientCommand = "npm exec --no -- tsp-client init --update-if-exists --tsp-config $tspConfigFile --repo $repo --commit $commitid"
-            if ($swaggerDir) {
-                $tspclientCommand += " --local-spec-repo $typespecFolder"
-            }
-            Write-Host $tspclientCommand
-            Invoke-Expression $tspclientCommand
         }
         finally {
             Pop-Location
         }
 
+        # Use tsp-client from pinned version by passing --prefix to use tsp-client from that directory
+        $tspclientCommand = "npm exec --prefix $tspClientDir --no -- tsp-client init --update-if-exists --tsp-config $tspConfigFile --repo $repo --commit $commitid"
+        if ($swaggerDir) {
+            $tspclientCommand += " --local-spec-repo $typespecFolder"
+        }
+        Write-Host $tspclientCommand
+        Invoke-Expression $tspclientCommand
+        
         if ($LASTEXITCODE) {
           # If Process script call fails, then return with failure to CI and don't need to call GeneratePackage
           Write-Host "[ERROR] Failed to generate typespec project:$typespecFolder. Exit code: $LASTEXITCODE. Please review the detail errors for potential fixes. If the issue persists, contact the DotNet language support channel at $DotNetSupportChannelLink and include this spec pull request."