feat: add `Model::firstOrInsert()` with failure handling #14450

Job	Run time
Setup PHP Version for Code Coverage	2s
Others (8.4) / Sanity Tests	2m 41s
Others (8.2) / Sanity Tests	4m 24s
Others (8.5) / Sanity Tests	2m 44s
Others (8.3) / Sanity Tests	2m 34s
CacheLive (8.3) / Cache Live Tests	2m 19s
CacheLive (8.2) / Cache Live Tests	2m 26s
CacheLive (8.5) / Cache Live Tests	2m 15s
CacheLive (8.4) / Cache Live Tests	2m 22s
SeparateProcess (8.3) / tests	3m 30s
SeparateProcess (8.5) / tests	3m 18s
SeparateProcess (8.4) / tests	3m 23s
DatabaseLive (8.3, OCI8, 8.0) / tests	7m 54s
SeparateProcess (8.2) / tests	3m 38s
DatabaseLive (8.5, OCI8, 8.0) / tests	7m 5s
DatabaseLive (8.2, SQLite3, 8.0) / tests	3m 6s
DatabaseLive (8.2, SQLSRV, 8.0) / tests	6m 55s
DatabaseLive (8.5, Postgre, 8.0) / tests	2m 48s
DatabaseLive (8.3, Postgre, 8.0) / tests	2m 51s
DatabaseLive (8.2, MySQLi, 8.0) / tests	4m 56s
DatabaseLive (8.2, OCI8, 8.0) / tests	7m 34s
DatabaseLive (8.2, Postgre, 8.0) / tests	3m 38s
DatabaseLive (8.5, SQLite3, 8.0) / tests	2m 29s
DatabaseLive (8.3, SQLSRV, 8.0) / tests	5m 58s
DatabaseLive (8.3, SQLite3, 8.0) / tests	2m 22s
DatabaseLive (8.4, Postgre, 8.0) / tests	2m 57s
DatabaseLive (8.4, SQLite3, 8.0) / tests	2m 42s
DatabaseLive (8.4, SQLSRV, 8.0) / tests	5m 58s
DatabaseLive (8.2, MySQLi, 5.7) / tests	3m 57s
DatabaseLive (8.3, MySQLi, 8.0) / tests	4m 47s
DatabaseLive (8.5, SQLSRV, 8.0) / tests	6m 8s
DatabaseLive (8.4, MySQLi, 8.0) / tests	4m 47s
DatabaseLive (8.5, MySQLi, 8.0) / tests	4m 52s
DatabaseLive (8.4, OCI8, 8.0) / tests	7m 20s
Upload coverage results to Coveralls / coveralls	41s
	2h 17m 21s

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