fix: prioritize headers set by the `Response` class #12692

Job	Run time
Setup PHP Version for Code Coverage	1s
Others (8.4) / Sanity Tests	2m 18s
Others (8.2) / Sanity Tests	3m 50s
Others (8.1) / Sanity Tests	2m 16s
Others (8.3) / Sanity Tests	2m 34s
CacheLive (8.1) / Cache Live Tests	1m 54s
CacheLive (8.3) / Cache Live Tests	2m 4s
CacheLive (8.2) / Cache Live Tests	2m 31s
CacheLive (8.4) / Cache Live Tests	1m 55s
SeparateProcess (8.1) / tests	3m 14s
SeparateProcess (8.2) / tests	3m 22s
SeparateProcess (8.3) / tests	3m 30s
SeparateProcess (8.4) / tests	3m 2s
DatabaseLive (8.1, MySQLi, 5.7) / tests	2m 59s
DatabaseLive (8.1, MySQLi, 8.0) / tests	4m 42s
DatabaseLive (8.1, OCI8, 8.0) / tests	5m 58s
DatabaseLive (8.1, Postgre, 8.0) / tests	2m 46s
DatabaseLive (8.1, SQLite3, 8.0) / tests	2m 33s
DatabaseLive (8.1, SQLSRV, 8.0) / tests	4m 12s
DatabaseLive (8.2, OCI8, 8.0) / tests	6m 37s
DatabaseLive (8.2, MySQLi, 8.0) / tests	5m 2s
DatabaseLive (8.2, Postgre, 8.0) / tests	3m 14s
DatabaseLive (8.2, SQLite3, 8.0) / tests	3m 13s
DatabaseLive (8.2, SQLSRV, 8.0) / tests	4m 38s
DatabaseLive (8.3, MySQLi, 8.0) / tests	4m 20s
DatabaseLive (8.3, OCI8, 8.0) / tests	5m 51s
DatabaseLive (8.3, Postgre, 8.0) / tests	2m 44s
DatabaseLive (8.3, SQLite3, 8.0) / tests	2m 34s
DatabaseLive (8.3, SQLSRV, 8.0) / tests	4m 42s
DatabaseLive (8.4, MySQLi, 8.0) / tests	4m 22s
DatabaseLive (8.4, Postgre, 8.0) / tests	2m 22s
DatabaseLive (8.4, OCI8, 8.0) / tests	5m 51s
DatabaseLive (8.4, SQLite3, 8.0) / tests	2m 40s
DatabaseLive (8.4, SQLSRV, 8.0) / tests	4m 20s
Upload coverage results to Coveralls / coveralls	42s
	1h 58m 53s

Provide feedback