fix: prioritize headers set by the `Response` class #12671

Job	Run time
Setup PHP Version for Code Coverage	1s
Others (8.2) / Sanity Tests	3m 56s
Others (8.1) / Sanity Tests	2m 35s
Others (8.3) / Sanity Tests	2m 24s
Others (8.4) / Sanity Tests	2m 33s
CacheLive (8.1) / Cache Live Tests	2m 2s
CacheLive (8.2) / Cache Live Tests	2m 29s
CacheLive (8.3) / Cache Live Tests	2m 1s
CacheLive (8.4) / Cache Live Tests	2m 4s
DatabaseLive (8.1, MySQLi, 8.0) / tests	5m 17s
DatabaseLive (8.1, MySQLi, 5.7) / tests	3m 18s
DatabaseLive (8.1, Postgre, 8.0) / tests	2m 31s
DatabaseLive (8.1, OCI8, 8.0) / tests	5m 51s
DatabaseLive (8.1, SQLite3, 8.0) / tests	2m 40s
DatabaseLive (8.2, MySQLi, 8.0) / tests	5m 24s
DatabaseLive (8.1, SQLSRV, 8.0) / tests	4m 18s
DatabaseLive (8.2, OCI8, 8.0) / tests	6m 33s
DatabaseLive (8.2, Postgre, 8.0) / tests	3m 12s
DatabaseLive (8.2, SQLite3, 8.0) / tests	3m 35s
DatabaseLive (8.2, SQLSRV, 8.0) / tests	4m 42s
DatabaseLive (8.3, MySQLi, 8.0) / tests	4m 32s
DatabaseLive (8.3, OCI8, 8.0) / tests	5m 52s
DatabaseLive (8.3, Postgre, 8.0) / tests	2m 25s
DatabaseLive (8.3, SQLite3, 8.0) / tests	2m 38s
DatabaseLive (8.3, SQLSRV, 8.0) / tests	3m 58s
DatabaseLive (8.4, OCI8, 8.0) / tests	6m 1s
DatabaseLive (8.4, Postgre, 8.0) / tests	2m 22s
DatabaseLive (8.4, MySQLi, 8.0) / tests	3m 45s
DatabaseLive (8.4, SQLite3, 8.0) / tests	2m 13s
DatabaseLive (8.4, SQLSRV, 8.0) / tests	4m 34s
SeparateProcess (8.1) / tests	3m 29s
SeparateProcess (8.3) / tests	3m 14s
SeparateProcess (8.2) / tests	3m 50s
SeparateProcess (8.4) / tests	3m 0s
Upload coverage results to Coveralls / coveralls	47s
	2h 0m 6s

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