Aligned PHPStan baseline and updated Symfony deprecations helper sett… #2215

Job	Run time
Unit tests & SQLite integration tests (7.4)	9m 2s
Unit tests & SQLite integration tests (8.0)	9m 4s
Solr integration tests (7.4)	13m 12s
Run code style check (8.0)	2m 34s
Unit tests & SQLite integration tests (8.1)	11m 14s
Solr integration tests (8.0)	13m 46s
Solr integration tests (8.1)	13m 14s
PostgreSQL integration tests (7.4)	30m 6s
MySQL integration tests (7.4)	14m 27s
MySQL integration tests (8.0)	14m 30s
PostgreSQL integration tests (8.0)	28m 11s
MySQL integration tests (8.1)	14m 40s
PostgreSQL integration tests (8.1)	26m 48s
	3h 20m 48s

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