chore: resolve PHPStan nullCoalesce and isset errors on Config properties #14587

Job	Run time
Setup PHP Version for Code Coverage	3s
Others (8.3) / Sanity Tests	2m 48s
Others (8.4) / Sanity Tests	2m 50s
Others (8.5) / Sanity Tests	2m 51s
Others (8.2) / Sanity Tests	4m 22s
CacheLive (8.5) / Cache Live Tests	2m 19s
CacheLive (8.4) / Cache Live Tests	2m 12s
CacheLive (8.2) / Cache Live Tests	2m 23s
CacheLive (8.3) / Cache Live Tests	2m 5s
SeparateProcess (8.3) / tests	3m 20s
SeparateProcess (8.2) / tests	3m 38s
DatabaseLive (8.4, MySQLi, 8.0) / tests	4m 15s
SeparateProcess (8.4) / tests	3m 23s
DatabaseLive (8.2, Postgre, 8.0) / tests	3m 25s
SeparateProcess (8.5) / tests	3m 25s
DatabaseLive (8.2, SQLSRV, 8.0) / tests	7m 18s
DatabaseLive (8.2, MySQLi, 5.7) / tests	3m 48s
DatabaseLive (8.3, Postgre, 8.0) / tests	2m 54s
DatabaseLive (8.3, SQLite3, 8.0) / tests	2m 10s
DatabaseLive (8.3, MySQLi, 8.0) / tests	5m 31s
DatabaseLive (8.5, SQLite3, 8.0) / tests	2m 16s
DatabaseLive (8.5, Postgre, 8.0) / tests	2m 53s
DatabaseLive (8.5, SQLSRV, 8.0) / tests	5m 56s
DatabaseLive (8.5, OCI8, 8.0) / tests	7m 26s
DatabaseLive (8.2, SQLite3, 8.0) / tests	3m 4s
DatabaseLive (8.2, OCI8, 8.0) / tests	8m 23s
DatabaseLive (8.4, OCI8, 8.0) / tests	8m 26s
DatabaseLive (8.3, OCI8, 8.0) / tests	7m 42s
DatabaseLive (8.4, SQLite3, 8.0) / tests	2m 1s
DatabaseLive (8.3, SQLSRV, 8.0) / tests	5m 44s
DatabaseLive (8.2, MySQLi, 8.0) / tests	5m 23s
DatabaseLive (8.5, MySQLi, 8.0) / tests	5m 21s
DatabaseLive (8.4, SQLSRV, 8.0) / tests	7m 1s
DatabaseLive (8.4, Postgre, 8.0) / tests	2m 46s
Upload coverage results to Coveralls / coveralls	42s
	2h 20m 4s

Provide feedback