Add option to restrict share autocomplete to group members

[PVince81]

Description

When set, the autocomplete only displays user or group results matching
the current user's group memberships.

Typing a full user or group name not in the result list will still allow
sharing with these entries.

Related Issue

Fixes #27849

Motivation and Context

See issue

How Has This Been Tested?

When the new option is set:

• TEST: autocomplete only show current user's user results
• TEST: autocomplete only show current user's group results
• TEST: typing full recipient user name not in result list still allows sharing
• TEST: typing full recipient group name not in result list still allows sharing

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

TODOs:

• beware of potential conflict with Extend accounts table for custom search attributes #27832, might need rebase/retesting after that one
• add unit tests
• add integration tests

@jvillafanez @tomneedham @pmaier1

[felixboehm]

👍 Code looks good.

[PVince81]

Tests added. Turns out we already had sharee tests so it was much easier to add new ones.

I suggest we merge this. Once @tomneedham rebases #27832 the integration tests will tell whether this still works with his changes.

[PVince81]

rebased for CI

[PVince81]

Test Result (1 failure )
sharing.Increasing permissions is allowed for owner

11:44:52 /var/lib/jenkins/workspace/owncloud-core_core_PR-27869-PFEZRZD5FK7SZH2ETSWIQLOH5DH7VH6KYURTFPNPUUQEXLM2E42A/tests/integration/features/sharing-v1.feature:1051

Uh oh

[PVince81]

UH OH!! This fails on master as well 😱

I'll have a look...

[PVince81]

this PR fixes the test issue from master: #27888

[lock]

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