Fix timestamp check to use workflow filename instead of workflow name

The check_workflow_timestamp.cjs script was using GITHUB_WORKFLOW which contains
the workflow name (e.g., "Dev") instead of the workflow filename. This caused
it to try reading the wrong file.

Fixed by:
- Adding lockFilename parameter to buildActivationJob()
- Passing the lock filename as GH_AW_WORKFLOW_FILE environment variable
- Updated JavaScript to use GH_AW_WORKFLOW_FILE instead of GITHUB_WORKFLOW
- Added quotes around the filename value to handle special characters
- Updated tests to use the new environment variable

Co-authored-by: pelikhan <[email protected]>

Author: Copilot