[15.0][IMP] account_operating_unit: add OU in move line outstanding payment

[Saran440]

Step to test:

1. Create vendor bills > confirm > register payment (register payment with journal is not set operating unit)
2. JE will not add OU in Outstanding Payment

This PR is add OU following:

• self-balanced and set operating unit in journal = Outstanding Payment will add OU journal
• self-balanced and not set operating unit in journal = Error
• Not self-balanced and set operating unit in journal = Outstanding Payment will add OU journal
• Not self-balanced and Not operating unit in journal = Outstanding Payment will add OU from invoices

[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). 🤖

[AaronHForgeFlow]

/ocabot merge patch

[OCA-git-bot]

Hey, thanks for contributing! Proceeding to merge this for you. Prepared branch 15.0-ocabot-merge-pr-582-by-AaronHForgeFlow-bump-patch, awaiting test results.

[OCA-git-bot]

Congratulations, your PR was merged at 74cf428b6eca6177061f61217f7f99e7df88fb15. Thanks a lot for contributing to OCA. ❤️