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Backport: Skip pull_request triggered runs in private repos - 6.3 Branch #65343

Job	Run time
PHP 7.4 / MySQL 5.7 multisite	7m 52s
PHP 7.4 / MySQL 5.7 with memcached	8m 28s
PHP 8.0 / MySQL 5.7 multisite	8m 1s
PHP 8.2 / MySQL 5.7	7m 27s
PHP 7.0 / MySQL 5.7	7m 35s
PHP 8.0 / MySQL 5.7	8m 13s
PHP 7.4 / MySQL 5.7 multisite with memcached	7m 33s
PHP 7.0 / MySQL 5.7 multisite	9m 2s
PHP 8.2 / MySQL 5.7 multisite	8m 12s
PHP 7.4 / MySQL 5.7 (test reporting enabled)	8m 36s
Slack Notifications	0s
Failed workflow tasks	0s
	1h 20m 59s