[Github] Test pr-code-lint workflow on changes to workflow (#159968)

This patch ensures that the pr-code-lint workflow is run for testing
whenever the workflow file is changed. This will not catch actual
functionality issues on most changes but does ensure that the workflow
is not completely broken.

Author: boomanaiden154

.github/workflows/pr-code-lint.yml

@@ -10,6 +10,7 @@ on:
       - 'users/**'
     paths:
       - 'clang-tools-extra/clang-tidy/**'
+      - '.github/workflows/pr-code-lint.yml'
 
 jobs:
   code_linter: