feat: introduce `transformRelated()` for smart and isolated relationship transformations #15308

Job	Run time
Setup PHP Version for Code Coverage	3s
Others (8.5) / Sanity Tests	1m 56s
Others (8.2) / Sanity Tests	3m 21s
Others (8.3) / Sanity Tests	1m 48s
Others (8.4) / Sanity Tests	1m 36s
CacheLive (8.3) / Cache Live Tests	1m 33s
CacheLive (8.2) / Cache Live Tests	1m 38s
CacheLive (8.5) / Cache Live Tests	1m 33s
SeparateProcess (8.2) / tests	1m 57s
SeparateProcess (8.5) / tests	2m 20s
SeparateProcess (8.3) / tests	1m 54s
SeparateProcess (8.4) / tests	2m 2s
CacheLive (8.4) / Cache Live Tests	1m 29s
DatabaseLive (8.4, SQLSRV, 8.0) / tests	5m 11s
DatabaseLive (8.4, OCI8, 8.0) / tests	7m 48s
DatabaseLive (8.3, SQLite3, 8.0) / tests	1m 17s
DatabaseLive (8.2, MySQLi, 8.0) / tests	5m 12s
DatabaseLive (8.4, Postgre, 8.0) / tests	1m 39s
DatabaseLive (8.3, SQLSRV, 8.0) / tests	6m 33s
DatabaseLive (8.5, SQLite3, 8.0) / tests	1m 8s
DatabaseLive (8.2, SQLSRV, 8.0) / tests	6m 33s
DatabaseLive (8.5, MySQLi, 8.0) / tests	3m 28s
DatabaseLive (8.4, MySQLi, 8.0) / tests	8m 13s
DatabaseLive (8.3, OCI8, 8.0) / tests	7m 54s
DatabaseLive (8.4, SQLite3, 8.0) / tests	1m 13s
DatabaseLive (8.5, SQLSRV, 8.0) / tests	5m 31s
DatabaseLive (8.2, SQLite3, 8.0) / tests	2m 25s
DatabaseLive (8.2, MySQLi, 5.7) / tests	4m 58s
DatabaseLive (8.5, OCI8, 8.0) / tests	7m 47s
DatabaseLive (8.2, OCI8, 8.0) / tests	8m 56s
DatabaseLive (8.3, MySQLi, 8.0) / tests	3m 35s
DatabaseLive (8.2, Postgre, 8.0) / tests	3m 9s
DatabaseLive (8.5, Postgre, 8.0) / tests	2m 59s
DatabaseLive (8.3, Postgre, 8.0) / tests	2m 15s
Upload coverage results to Coveralls / coveralls	42s
	2h 1m 36s

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