[16.0][FIX] account_operating_unit: do not show inter-OU balance journals as invoice lines

[AaronHForgeFlow]

Fixes: #617

FW port of: #705

Converted boolean in the field display_type. Same as Odoo did in here: odoo/odoo@d8d47f9

Also added the operating unit column in the journal items list inside the journal entry form. That must be removed by mistake during the migration.

@ForgeFlow

[AaronHForgeFlow]

@JordiMForgeFlow @MiquelRForgeFlow I would appreciate your reviews, as long you reviewed the original code

[MiquelRForgeFlow]

LGTM

[github-actions]

There hasn't been any activity on this pull request in the past 4 months, so it has been marked as stale and it will be closed automatically if no further activity occurs in the next 30 days.
If you want this PR to never become stale, please ask a PSC member to apply the "no stale" label.

[AaronHForgeFlow]

/ocabot rebase

[OCA-git-bot]

@AaronHForgeFlow The rebase process failed, because command git push --force ForgeFlow tmp-pr-708:16.0-fix-account_operating_unit-inter-ou-as-invoice-line failed with output:

remote: Permission to ForgeFlow/operating-unit.git denied to OCA-git-bot.
fatal: unable to access 'https://github.com/ForgeFlow/operating-unit/': The requested URL returned error: 403

[AaronHForgeFlow]

Even thought this appears not to be an issue in v16, I'd like to continue with the forward ports:

• Makes sense to have another display type for these special journal items
• Easy to migrate between versions

Reviews welcome!

[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). 🤖