refactor: use uppercase HTTP method names in `FeatureTestTrait` #14410

Job	Run time
Setup PHP Version for Code Coverage	3s
Others (8.4) / Sanity Tests	2m 45s
Others (8.3) / Sanity Tests	2m 39s
Others (8.5) / Sanity Tests	6m 17s
Others (8.2) / Sanity Tests	9m 4s
CacheLive (8.4) / Cache Live Tests	2m 23s
CacheLive (8.5) / Cache Live Tests	2m 17s
CacheLive (8.3) / Cache Live Tests	2m 14s
CacheLive (8.2) / Cache Live Tests	2m 48s
SeparateProcess (8.3) / tests	3m 34s
SeparateProcess (8.4) / tests	3m 35s
DatabaseLive (8.3, OCI8, 8.0) / tests	7m 2s
SeparateProcess (8.2) / tests	3m 23s
DatabaseLive (8.2, SQLite3, 8.0) / tests	3m 2s
SeparateProcess (8.5) / tests	3m 41s
DatabaseLive (8.4, MySQLi, 8.0) / tests	4m 46s
DatabaseLive (8.5, MySQLi, 8.0) / tests	4m 46s
DatabaseLive (8.4, SQLSRV, 8.0) / tests	6m 29s
DatabaseLive (8.2, SQLSRV, 8.0) / tests	6m 22s
DatabaseLive (8.4, Postgre, 8.0) / tests	2m 58s
DatabaseLive (8.2, MySQLi, 5.7) / tests	3m 41s
DatabaseLive (8.4, SQLite3, 8.0) / tests	2m 31s
DatabaseLive (8.3, SQLite3, 8.0) / tests	2m 27s
DatabaseLive (8.5, OCI8, 8.0) / tests	7m 25s
DatabaseLive (8.2, MySQLi, 8.0) / tests	5m 7s
DatabaseLive (8.3, MySQLi, 8.0) / tests	5m 2s
DatabaseLive (8.2, OCI8, 8.0) / tests	7m 29s
DatabaseLive (8.3, SQLSRV, 8.0) / tests	5m 23s
DatabaseLive (8.5, SQLite3, 8.0) / tests	2m 30s
DatabaseLive (8.4, OCI8, 8.0) / tests	6m 44s
DatabaseLive (8.5, Postgre, 8.0) / tests	2m 48s
DatabaseLive (8.2, Postgre, 8.0) / tests	3m 31s
DatabaseLive (8.5, SQLSRV, 8.0) / tests	5m 32s
DatabaseLive (8.3, Postgre, 8.0) / tests	3m 5s
Upload coverage results to Coveralls / coveralls	46s
	2h 24m 9s

Provide feedback