Revert "Issue 51017 - Implement dynamic ds/bz pytest markers"
    
    Apparently, in some situations, grepping over all the files gets very
    slow due to filesystem implementation (e.g. docker on MacOS) specifics.
    
    Instead of this implementation, we'll rather look into pre-commit hooks
    adding new markings on the fly.
    
    This reverts commit 6a7a154159583c09fcbba0578eaf576d577ccb11.
    
    Relates: https://pagure.io/389-ds-base/issue/51017