Cleanup Server.php (aliases & services)

[rullzer]

As discussed with @MorrisJobke

We regsiter a lot of plain text aliases like

server/lib/private/Server.php

Line 182 in 9319d55

$this->registerAlias('CalendarManager', \OC\Calendar\Manager::class);

They should all die. Services should be queries properly using their servicename.

Ideally we also remove as much simple wrappers as possible like:

server/lib/private/Server.php

Lines 256 to 258 in 9319d55

	$this->registerService('TagMapper', function (Server $c) {
	return new TagMapper($c->getDatabaseConnection());
	});

The DI can handle that all perfectly by itself when it is actually needed.

[nextcloud-bot]

GitMate.io thinks possibly related issues are #10744 (Update help.php), #829 (copyright in version.php), #6784 (Php error?), #4743 ("php occ trashbin:cleanup" removes files_trashbin/files from filesystem), and #4415 (Cleanup \OCP\Share).

[ChristophWurst]

They should all die. Services should be queries properly using their servicename.

This is largely done via the deprecated aliases.

Ideally we also remove as much simple wrappers as possible like

Partly done, but still some left to do.

[joshtrichards]

A lot of this work looks like it was covered in #19345 with #19347, #22202

registerAlias() plain text aliases:

• appear all gone (done in the sense they only still exist by way of registerDeprecatedAlias() references)

registerService() simple wrappers:

TBD