refactor: clear out phpstan errors in `Validation` source and tests #16112

Job	Run time
Setup PHP Version for Code Coverage	3s
Others (8.4) / Sanity Tests	1m 31s
Others (8.2) / Sanity Tests	3m 4s
Others (8.3) / Sanity Tests	1m 59s
Others (8.5) / Sanity Tests	1m 32s
SeparateProcess (8.4) / tests	2m 9s
CacheLive (8.2) / Cache Live Tests	1m 24s
SeparateProcess (8.2) / tests	1m 48s
CacheLive (8.5) / Cache Live Tests	1m 12s
SeparateProcess (8.5) / tests	2m 22s
DatabaseLive (8.2, SQLite3, 8.0) / tests	2m 0s
DatabaseLive (8.4, SQLite3, 8.0) / tests	1m 9s
DatabaseLive (8.2, MySQLi, 5.7) / tests	4m 17s
DatabaseLive (8.3, SQLSRV, 8.0) / tests	4m 42s
SeparateProcess (8.3) / tests	2m 6s
CacheLive (8.4) / Cache Live Tests	1m 7s
DatabaseLive (8.3, OCI8, 8.0) / tests	8m 37s
CacheLive (8.3) / Cache Live Tests	1m 4s
DatabaseLive (8.5, SQLSRV, 8.0) / tests	4m 57s
DatabaseLive (8.5, MySQLi, 8.0) / tests	3m 44s
DatabaseLive (8.5, OCI8, 8.0) / tests	7m 0s
DatabaseLive (8.4, Postgre, 8.0) / tests	1m 45s
DatabaseLive (8.2, MySQLi, 8.0) / tests	4m 54s
DatabaseLive (8.3, MySQLi, 8.0) / tests	3m 45s
DatabaseLive (8.2, Postgre, 8.0) / tests	3m 38s
DatabaseLive (8.4, SQLSRV, 8.0) / tests	5m 20s
DatabaseLive (8.3, Postgre, 8.0) / tests	1m 46s
DatabaseLive (8.2, SQLSRV, 8.0) / tests	5m 37s
DatabaseLive (8.5, SQLite3, 8.0) / tests	1m 4s
DatabaseLive (8.2, OCI8, 8.0) / tests	8m 56s
DatabaseLive (8.5, Postgre, 8.0) / tests	1m 59s
DatabaseLive (8.4, MySQLi, 8.0) / tests	3m 29s
DatabaseLive (8.3, SQLite3, 8.0) / tests	1m 6s
DatabaseLive (8.4, OCI8, 8.0) / tests	8m 33s
Upload coverage results to Coveralls / coveralls	46s
	1h 50m 25s

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