[18.0] Tests "doctest" are no longer run since Odoo 18

[florentx]

It can be seen on Github CI for 18.0 branch and related PRs.
For example the doctests embedded in queue_job.jobrunner.channels are not run.

This is due to changes in Odoo test loader:

• [IMP] Avoid test duplicate odoo/odoo#148660
• [FIX] base_vat, pos: enable some inherited tests odoo/odoo#157121

Maybe it is because of the 2nd PR above.

It is because Odoo test loader does not call anymore standard unittest.TestLoader().loadTestsFromModule(...)

[github-actions]

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