[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:

• odoo/odoo#148660
• 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[bot]]

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