test: remove useless `DotEnvTest` test (#9673) #13510

Job	Run time
Setup PHP Version for Code Coverage	2s
Others (8.2) / Sanity Tests	3m 54s
Others (8.1) / Sanity Tests	2m 24s
Others (8.3) / Sanity Tests	6m 41s
Others (8.4) / Sanity Tests	2m 50s
SeparateProcess (8.1) / tests	3m 39s
SeparateProcess (8.3) / tests	3m 32s
SeparateProcess (8.4) / tests	3m 26s
DatabaseLive (8.3, Postgre, 8.0) / tests	2m 56s
SeparateProcess (8.2) / tests	3m 24s
DatabaseLive (8.3, SQLSRV, 8.0) / tests	5m 11s
DatabaseLive (8.1, Postgre, 8.0) / tests	3m 0s
DatabaseLive (8.4, OCI8, 8.0) / tests	6m 22s
DatabaseLive (8.1, SQLSRV, 8.0) / tests	5m 6s
DatabaseLive (8.2, Postgre, 8.0) / tests	3m 53s
DatabaseLive (8.2, SQLite3, 8.0) / tests	3m 21s
DatabaseLive (8.3, MySQLi, 8.0) / tests	4m 25s
DatabaseLive (8.2, MySQLi, 8.0) / tests	5m 11s
DatabaseLive (8.3, OCI8, 8.0) / tests	6m 25s
DatabaseLive (8.1, SQLite3, 8.0) / tests	2m 46s
DatabaseLive (8.4, SQLite3, 8.0) / tests	2m 57s
DatabaseLive (8.4, MySQLi, 8.0) / tests	4m 38s
DatabaseLive (8.1, MySQLi, 8.0) / tests	5m 4s
DatabaseLive (8.2, SQLSRV, 8.0) / tests	5m 41s
DatabaseLive (8.1, MySQLi, 5.7) / tests	3m 24s
CacheLive (8.1) / Cache Live Tests	2m 19s
DatabaseLive (8.1, OCI8, 8.0) / tests	6m 11s
DatabaseLive (8.4, SQLSRV, 8.0) / tests	5m 13s
DatabaseLive (8.4, Postgre, 8.0) / tests	2m 45s
CacheLive (8.2) / Cache Live Tests	2m 47s
DatabaseLive (8.2, OCI8, 8.0) / tests	6m 59s
DatabaseLive (8.3, SQLite3, 8.0) / tests	2m 34s
CacheLive (8.3) / Cache Live Tests	2m 11s
CacheLive (8.4) / Cache Live Tests	2m 33s
Upload coverage results to Coveralls / coveralls	45s
	2h 14m 29s

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