feat: add optional merge directives for registrars #15514

Job	Run time
Setup PHP Version for Code Coverage	3s
Others (8.2) / Sanity Tests	3m 12s
Others (8.5) / Sanity Tests	1m 30s
Others (8.3) / Sanity Tests	1m 44s
Others (8.4) / Sanity Tests	1m 31s
SeparateProcess (8.5) / tests	2m 9s
SeparateProcess (8.2) / tests	2m 19s
SeparateProcess (8.4) / tests	1m 57s
CacheLive (8.3) / Cache Live Tests	1m 29s
SeparateProcess (8.3) / tests	2m 10s
CacheLive (8.5) / Cache Live Tests	1m 28s
CacheLive (8.2) / Cache Live Tests	1m 45s
DatabaseLive (8.2, MySQLi, 8.0) / tests	4m 32s
DatabaseLive (8.4, OCI8, 8.0) / tests	7m 29s
CacheLive (8.4) / Cache Live Tests	1m 27s
DatabaseLive (8.2, SQLSRV, 8.0) / tests	6m 45s
DatabaseLive (8.3, OCI8, 8.0) / tests	7m 26s
DatabaseLive (8.4, SQLite3, 8.0) / tests	1m 0s
DatabaseLive (8.3, SQLSRV, 8.0) / tests	5m 53s
DatabaseLive (8.4, SQLSRV, 8.0) / tests	5m 50s
DatabaseLive (8.4, MySQLi, 8.0) / tests	3m 26s
DatabaseLive (8.2, OCI8, 8.0) / tests	9m 21s
DatabaseLive (8.2, SQLite3, 8.0) / tests	2m 14s
DatabaseLive (8.3, Postgre, 8.0) / tests	2m 6s
DatabaseLive (8.5, OCI8, 8.0) / tests	8m 2s
DatabaseLive (8.5, SQLSRV, 8.0) / tests	5m 58s
DatabaseLive (8.3, SQLite3, 8.0) / tests	1m 4s
DatabaseLive (8.5, MySQLi, 8.0) / tests	3m 14s
DatabaseLive (8.4, Postgre, 8.0) / tests	1m 46s
DatabaseLive (8.5, Postgre, 8.0) / tests	2m 1s
DatabaseLive (8.5, SQLite3, 8.0) / tests	1m 1s
DatabaseLive (8.2, MySQLi, 5.7) / tests	3m 39s
DatabaseLive (8.2, Postgre, 8.0) / tests	2m 44s
DatabaseLive (8.3, MySQLi, 8.0) / tests	3m 26s
Upload coverage results to Coveralls / coveralls	50s
	1h 52m 31s

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