[16.0][FIX] audit_log: fix regression (Add/Remove User Group)

[BT-anieto]

When adding/removing a group in a user (and tracking a user or a partner), odoo sends a 'reified' val 'in_group_{group_id}'. We must convert this value into the real groups_id one.

This bug is now appearing after the merge of #2814 because of

server-tools/auditlog/models/rule.py

Line 395 in 7d79324

self.invalidate_recordset(vals.keys())

Steps to reproduce:

1. Set a rule for re.users models
2. Go to a user and select/unselect one of the groups he belongs to (only visible in debug mode)
3. Save

[BT-anieto]

@StefanRijnhart Could you please take a look?

[StefanRijnhart]

Thanks! This should be safe as it's what core Odoo does first thing in res.users' own write method: https://github.com/odoo/odoo/blob/47efddb/odoo/addons/base/models/res_users.py#L1611-L1612

To make sure this does not drop out in a future version, would it be possible to add a test?

[BT-anieto]

@StefanRijnhart I'll do it asap (Next week)

[BT-anieto]

@StefanRijnhart Done! :)

[StefanRijnhart]

Those are beautiful tests, thank you!

[BT-anieto]

@StefanRijnhart Do you know if it needs another review in order to be merged?

[StefanRijnhart]

@BT-anieto Yes, it does.

[flotho]

3 lines of code
80lines of test !
thanks for this
LGTM

[OCA-git-bot]

This PR has the approved label and has been created more than 5 days ago. It should therefore be ready to merge by a maintainer (or a PSC member if the concerned addon has no declared maintainer). 🤖

[StefanRijnhart]

/ocabot merge minor

[OCA-git-bot]

What a great day to merge this nice PR. Let's do it!
Prepared branch 16.0-ocabot-merge-pr-2834-by-StefanRijnhart-bump-minor, awaiting test results.

[OCA-git-bot]

Congratulations, your PR was merged at 5d16ec7. Thanks a lot for contributing to OCA. ❤️