fix(app-settings): limit app to group initial state

[elzody]

Summary

When you try to limit an app by a group, the dropdown is initially not filled with any groups. They only populate once you start typing the name of a group, which triggers a network request. This pull request provides the necessary initial state to the app list so that the groups are populated by default and you can quickly select one without searching.

TODO

• Write a proper test to make sure the dropdown is filled with some groups

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)
• Labels added where applicable (ex: bug/enhancement, 3. to review, feature component)
• Milestone added for target branch/version (ex: 32.x for stable32)

[juliusknorr]

Suggested change

	$serverData['systemGroups'] = $groups;
	$this->initialState->provideInitialState('usersSettings', $serverData);
	$this->initialState->provideInitialState('usersSettings', $groups);

[elzody]

I think it should probably rather be something like:

$this->initialState->provideInitialState('usersSettings', [ 'systemGroups' => $groups ]);

This is due to the front end reading it as such:
https://github.com/nextcloud/server/blob/master/apps/settings/src/store/users.js#L35-L38

[CarlSchwan]

Suggested change

	$groups = array_map(function (IGroup $group) {
	return [
	'id' => $group->getGID(),
	'name' => $group->getDisplayName(),
	];
	}, $this->groupManager->search('', 5));
	$groups = array_map(static fn (IGroup $group): array => [
	'id' => $group->getGID(),
	'name' => $group->getDisplayName(),
	], $this->groupManager->search('', 5));