test: add is_bdb_compiled helper #20458

Followup for #20202, needed by #16546.

Allow the functional test suite to skip tests that require BDB, as well as introduce specific logic to handle whether BDB support is enabled or not. It follows the same pattern as skip_if_no_sqlite and is_sqlite_compiled.

<!--e57a25ab6845829454e8d69fc972939a-->

The following sections might be updated with supplementary metadata relevant to reviewers and maintainers.

<!--174a7506f384e20aa4161008e828411d-->

Conflicts

Reviewers, this pull request conflicts with the following ones:

• #20267 (Disable and fix tests for when BDB is not compiled by achow101)

If you consider this pull request important, please also help to review the conflicting pull requests. Ideally, start with the one that should be merged first.

Code review ACK b87caf10b57fbab148949727f4004805be2bbc1d

This was already being done in #20267

The commit looked identical apart from the docstring, so I thought you wouldn't mind too much if this was merged first.

The commit looked identical apart from the docstring, so I thought you wouldn't mind too much if this was merged first.

Rebasing can be annoying :p

But yeah, it's fine.

Oops :-)