[stable22] Fix psalm

[CarlSchwan]

Backport of #30508

[skjnldsv]

Code scanning results / Psalm Failing after 23s — 24 new alerts including 7 errors, 24 fixes

[MichaIng]

Hmm 24 new and 24 fixed would be expected, but now it is 27 new and 24 fixed 🤔.

Some annotations are clear mistakes, like (!foo === bar) while meant was surely (foo !== bar) 😄. Shall we fix this right here or in a dedicated PR? The one in apps/user_ldap/lib/Access.php has been fixed in #30508 as well.

[skjnldsv]

Please edit the checker :)

ERROR: There were 2 additional files:
223 | .php-cs-fixer.dist.php
224 | vendor-bin
225 | ERROR: There were 1 missing files:
226 | .php_cs.dist