[stable22] show that the web updater is not recommended on big instances

[backportbot-nextcloud]

⚠️ This backport had conflicts and is incomplete ⚠️

backport of #31740

[szaimen]

/compile amend /

[szaimen]

/rebase

[artonge]

One PHPUnit test failing:

1) Test\User\DatabaseTest::testSearch
Failed asserting that actual size 3 matches expected size 2.

/home/runner/work/server/server/tests/lib/User/Backend.php:114
/home/runner/work/server/server/tests/lib/User/DatabaseTest.php:125

Looks unrelated, but it's oddly specific.

[szaimen]

One PHPUnit test failing:

1) Test\User\DatabaseTest::testSearch
Failed asserting that actual size 3 matches expected size 2.

/home/runner/work/server/server/tests/lib/User/Backend.php:114
/home/runner/work/server/server/tests/lib/User/DatabaseTest.php:125

Looks unrelated, but it's oddly specific.

Yes, strange. I'll rerun it for making sure.

[szaimen]

One PHPUnit test failing:

1) Test\User\DatabaseTest::testSearch
Failed asserting that actual size 3 matches expected size 2.

/home/runner/work/server/server/tests/lib/User/Backend.php:114
/home/runner/work/server/server/tests/lib/User/DatabaseTest.php:125

Looks unrelated, but it's oddly specific.

Yes, strange. I'll rerun it for making sure.

Seems like that worked but I seem to need to run the autoloader script...

[szaimen]

samba failure unrelated