Merges the two separate action workflows (block-workflow-yaml.yml and
validate-agentic-workflows.yml) into a single validate-agentic-workflows-pr.yml
with two jobs: check-forbidden-files runs first, then compile-workflows
runs only if the file check passes.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
