feat: add `Model::firstOrInsert()` with failure handling #14451

Job	Run time
Setup PHP Version for Code Coverage	3s
Others (8.5) / Sanity Tests	2m 51s
Others (8.4) / Sanity Tests	2m 33s
Others (8.2) / Sanity Tests	4m 20s
Others (8.3) / Sanity Tests	2m 54s
CacheLive (8.5) / Cache Live Tests	2m 7s
CacheLive (8.3) / Cache Live Tests	2m 6s
SeparateProcess (8.4) / tests	3m 19s
CacheLive (8.2) / Cache Live Tests	2m 23s
CacheLive (8.4) / Cache Live Tests	2m 17s
SeparateProcess (8.3) / tests	4m 34s
SeparateProcess (8.2) / tests	3m 32s
SeparateProcess (8.5) / tests	3m 38s
DatabaseLive (8.3, SQLSRV, 8.0) / tests	6m 7s
DatabaseLive (8.4, SQLite3, 8.0) / tests	2m 5s
DatabaseLive (8.2, MySQLi, 8.0) / tests	5m 22s
DatabaseLive (8.5, MySQLi, 8.0) / tests	5m 43s
DatabaseLive (8.3, OCI8, 8.0) / tests	6m 59s
DatabaseLive (8.2, SQLite3, 8.0) / tests	2m 57s
DatabaseLive (8.5, SQLSRV, 8.0) / tests	6m 56s
DatabaseLive (8.2, OCI8, 8.0) / tests	8m 21s
DatabaseLive (8.5, Postgre, 8.0) / tests	2m 57s
DatabaseLive (8.4, Postgre, 8.0) / tests	2m 51s
DatabaseLive (8.5, SQLite3, 8.0) / tests	2m 16s
DatabaseLive (8.5, OCI8, 8.0) / tests	7m 22s
DatabaseLive (8.4, OCI8, 8.0) / tests	6m 13s
DatabaseLive (8.4, MySQLi, 8.0) / tests	5m 31s
DatabaseLive (8.2, MySQLi, 5.7) / tests	4m 10s
DatabaseLive (8.2, SQLSRV, 8.0) / tests	6m 28s
DatabaseLive (8.2, Postgre, 8.0) / tests	3m 37s
DatabaseLive (8.3, SQLite3, 8.0) / tests	2m 32s
DatabaseLive (8.3, MySQLi, 8.0) / tests	4m 35s
DatabaseLive (8.4, SQLSRV, 8.0) / tests	7m 44s
DatabaseLive (8.3, Postgre, 8.0) / tests	2m 58s
Upload coverage results to Coveralls / coveralls	52s
	2h 21m 13s

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