Signed-off-by: Adrian DC <radian.dc@gmail.com>

As documented at: https://github.com/actions/stale it requires the
"actions: write" permission.

Also allow manually running the stale action.

…tManager

Add support for the new GitLab API parameters for validating existing
CI/CD configurations:
- content_ref: specify the branch, tag, or SHA to validate
- dry_run_ref: set branch/tag context for dry run simulations

The deprecated 'ref' parameter is kept for backward compatibility.

Also update documentation with examples showing how to validate
CI configuration from specific branches and with dry run simulation.

Fixes #3260

Also update CHANGELOG.md with missing entries.

Exclude dependency updates from being added to the CHANGELOG.md file in
the future.

Closes: #3209

The documentation incorrectly showed calling start() on the
ProjectPullMirror object (mirror.start()), but the method only
exists on the ProjectPullMirrorManager. Updated the example to
show the correct usage: project.pull_mirror.start().

Fixes #3269