feat: Add sharing activity for teams

[susnux]

This adds support for Teams (previously "Circles"), the user notification already work, but the notification for the owner and sharer need support in the files_sharing app.

So if this is merged we can add the required providers in files_sharing.

But one thing to mention: For groups we paginate the members, I did not find a nice way to do this with teams. So maybe @ArtificialOwl can have a look at the member query if there is something to improve performance wise (e.g. pagination?).

[cypress[bot]]

Activity    Run #2157

Run Properties:   Failed #2157  •  77ce8ecacb: feat: Add sharing activity for teams

Project	Activity
Branch Review	feat/activity-for-team-share
Run status	Failed #2157
Run duration	01m 16s
Commit	77ce8ecacb: feat: Add sharing activity for teams
Committer	Ferdinand Thiessen
View all properties for this run ↗︎

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Test results
Failures	2
Flaky	0
Pending	0
Skipped	8
Passing	0
View all changes introduced in this branch ↗︎

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Tests for review

  sidebar.cy.ts • 1 failed test • Run E2E

View Output

Test		Artifacts
Check activity listing in the sidebar > Has creation activity		Test Replay Screenshots

  settings.cy.ts • 1 failed test • Run E2E

View Output

Test		Artifacts
Check that user's settings survive a reload > Form survive a reload		Test Replay Screenshots

[susnux]

TIL: protected (Foo&Bar)|Baz $variable does not work with PHP 8.1 but only 8.2 :sweat_smile: (was in the test like: protected (Class&MockObject)|null $variable )

[susnux]

/backport to stable31