filed: stored: deprecate compatible config option

[alaaeddineelamri]

Thank you for contributing to the Bareos Project!

This PR deprecates the compatible configuration option without removing it or modifying the behaviour.

Please check

• Short description and the purpose of this PR is present above this paragraph
• Your name is present in the AUTHORS file (optional)

If you have any questions or problems, please give a comment in the PR.

Helpful documentation and best practices

• Git Workflow
• Automatic Sourcecode Formatting
• Check your commit messages

Checklist for the reviewer of the PR (will be processed by the Bareos team)

General

• PR name is meaningful
• Purpose of the PR is understood
• Commit descriptions are understandable and well formatted
• Check backport line
• Is the PR title usable as CHANGELOG entry?
• Separate commit for CHANGELOG.md ("update CHANGELOG.md"). The PR number is correct.

Source code quality

• Source code changes are understandable
• Variable and function names are meaningful
• Code comments are correct (logically and spelling)
• Required documentation changes are present and part of the PR
• bareos-check-sources --since-merge does not report any problems

[arogge]

It seems like our versions of clang-format differ on how to format the foreach_alist().
Also, I noticed that neither the FD nor the SD prints the deprecation warning on startup. It does when invoking with -t, but not during normal startup. We may want to figure out why (and if that is a regression in Bareos 22 or not).

[arogge]

looks great, lacks a CHANGELOG record though.