Follow #30495
"HasAccess" behavior wasn't clear, to make it clear:
* Use a new name `HasAnyUnitAccess`, it will be easier to review related
code and permission problems.
* Separate everyone access mode to a separate field, then all calls to
HasAccess are reverted to old behavior before #30495.
* Add new tests.
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Co-authored-by: Giteabot <teabot@gitea.io>