rename UnityGroup::userExists to memberExists

[simonLeary42]

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[Copilot]

Pull Request Overview

This PR renames the userExists method to memberExists in the UnityGroup class to better reflect its purpose of checking group membership. The change improves the semantic clarity of the API by using more descriptive naming.

• Renamed UnityGroup::userExists() method to UnityGroup::memberExists()
• Updated all method calls across the codebase to use the new method name
• Updated test assertions to use the renamed method

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
resources/lib/UnityGroup.php	Renamed method definition from userExists to memberExists
workers/remove-users-from-group.php	Updated method call to use new name
webroot/panel/groups.php	Updated method call to use new name
webroot/panel/ajax/get_group_members.php	Updated method call to use new name
test/functional/PiRemoveUserTest.php	Updated test assertions to use new method name
test/functional/PiMemberDenyTest.php	Updated test assertions to use new method name
test/functional/PiMemberApproveTest.php	Updated test assertions to use new method name
test/functional/PIMemberRequestTest.php	Updated test assertions to use new method name
test/functional/NewUserTest.php	Updated test assertions to use new method name

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