ci: Use our own pr_title_lint.py instead of NPM commitlint [citest_skip]

There are a few problems with the NPM commitlint

* NPM is problematic
* Having to install NPM and commitlint and dependencies is slow and heavyweight
* commitlint is overkill for our simple use case

We have our own pr_title_lint.py which is small and works exactly for our use case.

Enhance coderabbit checks for PRs and test cleanup

Signed-off-by: Rich Megginson <rmeggins@redhat.com>

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

@@ -22,11 +22,11 @@ jobs:
         with:
           fetch-depth: 0
 
-      - name: Install conventional-commit linter
-        run: npm install @commitlint/config-conventional @commitlint/cli
+      - name: Install pr_title_lint.py
+        run: curl -o pr_title_lint.py https://raw.githubusercontent.com/linux-system-roles/auto-maintenance/main/pr_title_lint.py
 
-      - name: Run commitlint on PR title
+      - name: Run pr_title_lint.py on PR title
         env:
           PR_TITLE: ${{ github.event.pull_request.title }}
         # Echo from env variable to avoid bash errors with extra characters
-        run: echo "$PR_TITLE" | npx commitlint --verbose
+        run: python3 pr_title_lint.py "${PR_TITLE}"