ci: remove include and exclude to avoid missing requirements-level

[ptamarit]

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Description

GitHub Action problems

The CI action has been failing for some time.
The problem is that the 2 jobs from the include section did not specify a python-version nor a requirements-level, and therefore failing on the requirements-builder ... --level= command.

• I removed the exclude section with mysql5 since it was later on also specified in the include section.
• I removed the include section and moved postgresql13 to the db-service matrix; all the other entries were already specified in db-service.

Tests which had been failing

• Some formatting issue
• A problem with Alembic which affected many repos; the resolution being to skip the Alembic test :(

Checklist

Ticks in all boxes and 🟢 on all GitHub actions status checks are required to merge:

• I'm aware of the code of conduct.
• I've created logical separate commits and followed the commit message format.
• I've added relevant test cases.
• I've added relevant documentation.
• I've marked translation strings (for relevant code).
• I've followed the CSS/JS and React guidelines (for relevant code).
• I've followed the web accessibility guidelines (for relevant code).
• I've followed the user interface guidelines (for relevant code).
• I've identified the copyright holder(s) and updated copyright headers for touched files (>15 lines contributions).
• I've NOT included third-party code (copy/pasted source code or new dependencies).

Third-party code

If you've added third-party code (copy/pasted or new dependencies), please reach out to an architect.

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