[12.0] Backport `partner_stage`
@SilvioC2C https://github.com/OCA/partner-contact/pull/1403
@simahawk waiting for #1403 to be merged, then I'll rebase both this PR and #1402
@SilvioC2C I don't have time to cleanup the pre-commit issues. Can you please check the errors on my PR and fix them all with a Apply pre-commit conf or Fix linting?
@simahawk I'll give it a try, thanks for your help so far :fireworks:
you can rebase now ;)
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@simahawk Could you review this? As old branch, we can merge it fast.