ci: Simplify rollback logic for uncommitted changes in CI workflow

Author: mbfakourii

.github/workflows/ci.yml

@@ -52,8 +52,19 @@ jobs:
       - name: Lint
         run: dart format --output=none --set-exit-if-changed packages/dart
       - name: Rollback uncommitted changes for Fix Bug mocks
+        shell: pwsh
         run: |
-          git checkout -- packages\dart\test\src\network\parse_query_test.mocks.dart packages\dart\test\src\objects\parse_object\parse_object_test.mocks.dart
+          $files = @(
+            "packages\dart\test\src\network\parse_query_test.mocks.dart",
+            "packages\dart\test\src\objects\parse_object\parse_object_test.mocks.dart"
+          )
+          $files | ForEach-Object {
+            if (Test-Path $_) {
+              git checkout -- $_
+            } else {
+              Write-Host "File $_ does not exist, skipping checkout."
+            }
+          }
       - name: Publish dry run
         run: cd packages/dart && dart pub publish --dry-run
       - name: Run tests