Unify permission system for setting allowed teams during upload

[fm3]

Fixed a bug where dataset managers were not allowed to assign teams to new datasets that they are only member of. This already worked while editing the dataset later (also for folders), but not during upload.

URL of deployed dev instance (used for testing):

• https://uploadinitialteams.webknossos.xyz

Steps to test:

• Make a user team manager and member of a team
• As that user, upload a dataset, and assign that team to the dataset during the upload.
• Should be allowed

Issues:

• fixes Dataset Managers: Allow to add teams to dataset they are only member of? #7451

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• Updated changelog
• Considered common edge cases

[frcroth]

nvm