test: fix cache test race conditions #15871

Job	Run time
Setup PHP Version for Code Coverage	3s
Others (8.4) / Sanity Tests	1m 43s
Others (8.5) / Sanity Tests	1m 23s
Others (8.2) / Sanity Tests	3m 13s
Others (8.3) / Sanity Tests	1m 55s
SeparateProcess (8.2) / tests	2m 13s
SeparateProcess (8.3) / tests	2m 13s
SeparateProcess (8.5) / tests	2m 12s
SeparateProcess (8.4) / tests	2m 14s
CacheLive (8.4) / Cache Live Tests	1m 4s
CacheLive (8.2) / Cache Live Tests	1m 19s
CacheLive (8.5) / Cache Live Tests	1m 8s
DatabaseLive (8.4, SQLSRV, 8.0) / tests	6m 4s
CacheLive (8.3) / Cache Live Tests	1m 25s
DatabaseLive (8.2, SQLite3, 8.0) / tests	2m 5s
DatabaseLive (8.3, MySQLi, 8.0) / tests	3m 9s
DatabaseLive (8.4, MySQLi, 8.0) / tests	3m 51s
DatabaseLive (8.5, SQLite3, 8.0) / tests	1m 9s
DatabaseLive (8.4, OCI8, 8.0) / tests	16m 2s
DatabaseLive (8.4, Postgre, 8.0) / tests	2m 4s
DatabaseLive (8.4, SQLite3, 8.0) / tests	1m 6s
DatabaseLive (8.3, OCI8, 8.0) / tests	6m 42s
DatabaseLive (8.2, OCI8, 8.0) / tests	7m 51s
DatabaseLive (8.2, MySQLi, 5.7) / tests	3m 26s
DatabaseLive (8.5, OCI8, 8.0) / tests	7m 49s
DatabaseLive (8.2, SQLSRV, 8.0) / tests	6m 52s
DatabaseLive (8.2, Postgre, 8.0) / tests	2m 34s
DatabaseLive (8.2, MySQLi, 8.0) / tests	5m 39s
DatabaseLive (8.3, Postgre, 8.0) / tests	1m 43s
DatabaseLive (8.5, MySQLi, 8.0) / tests	2m 56s
DatabaseLive (8.5, Postgre, 8.0) / tests	1m 43s
DatabaseLive (8.3, SQLite3, 8.0) / tests	1m 27s
DatabaseLive (8.5, SQLSRV, 8.0) / tests	4m 45s
DatabaseLive (8.3, SQLSRV, 8.0) / tests	4m 43s
Upload coverage results to Coveralls / coveralls	42s
	1h 56m 27s

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