refactor: Remove dead code from MySQLi Connection related to PHP 5 (#… #14100

Job	Run time
Setup PHP Version for Code Coverage	2s
Others (8.3) / Sanity Tests	2m 21s
Others (8.1) / Sanity Tests	2m 30s
Others (8.2) / Sanity Tests	3m 24s
Others (8.4) / Sanity Tests	2m 21s
CacheLive (8.4) / Cache Live Tests	2m 7s
SeparateProcess (8.1) / tests	3m 46s
CacheLive (8.1) / Cache Live Tests	2m 8s
CacheLive (8.3) / Cache Live Tests	2m 5s
SeparateProcess (8.3) / tests	3m 41s
SeparateProcess (8.4) / tests	3m 43s
SeparateProcess (8.2) / tests	3m 22s
DatabaseLive (8.3, SQLite3, 8.0) / tests	2m 23s
DatabaseLive (8.4, SQLSRV, 8.0) / tests	5m 30s
DatabaseLive (8.3, OCI8, 8.0) / tests	6m 2s
DatabaseLive (8.1, Postgre, 8.0) / tests	2m 31s
DatabaseLive (8.3, SQLSRV, 8.0) / tests	5m 5s
DatabaseLive (8.3, Postgre, 8.0) / tests	2m 52s
DatabaseLive (8.2, SQLite3, 8.0) / tests	2m 46s
DatabaseLive (8.2, Postgre, 8.0) / tests	3m 19s
CacheLive (8.2) / Cache Live Tests	2m 6s
DatabaseLive (8.4, Postgre, 8.0) / tests	2m 46s
DatabaseLive (8.4, MySQLi, 8.0) / tests	4m 26s
DatabaseLive (8.1, SQLite3, 8.0) / tests	2m 27s
DatabaseLive (8.1, MySQLi, 8.0) / tests	3m 59s
DatabaseLive (8.1, MySQLi, 5.7) / tests	3m 21s
DatabaseLive (8.4, SQLite3, 8.0) / tests	2m 22s
DatabaseLive (8.1, SQLSRV, 8.0) / tests	5m 6s
DatabaseLive (8.2, SQLSRV, 8.0) / tests	5m 49s
DatabaseLive (8.1, OCI8, 8.0) / tests	6m 54s
DatabaseLive (8.4, OCI8, 8.0) / tests	5m 46s
DatabaseLive (8.2, MySQLi, 8.0) / tests	4m 45s
DatabaseLive (8.3, MySQLi, 8.0) / tests	4m 14s
DatabaseLive (8.2, OCI8, 8.0) / tests	7m 3s
Upload coverage results to Coveralls / coveralls	37s
	2h 3m 39s

Provide feedback