[stable31] fix(sharing): Allow public share access for everyone

[backportbot[bot]]

Backport of PR #55811

[solracsf]

Failure is related.

There was 1 failure:

1) Test\Share20\ManagerTest::testGetShareByTokenShareOwnerExcludedFromLinkShares
Failed asserting that exception of type "Error" matches expected exception "OCP\Share\Exceptions\ShareNotFound". Message was: "Class "Test\Share20\Constants" not found" at
/home/runner/actions-runner/_work/server/server/tests/lib/Share20/ManagerTest.php:3315