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Backport: Skip pull_request triggered runs in private repos - 5.9 Branch #65342

Job	Run time
PHP 7.0 / MySQL 5.7 multisite	7m 37s
PHP 7.4 / MySQL 5.7 multisite with memcached	7m 57s
PHP 7.4 / MySQL 5.7 (test reporting enabled)	6m 50s
PHP 5.6 / MySQL 5.7 multisite	12m 35s
PHP 5.6 / MySQL 5.7	10m 41s
PHP 8.0 / MySQL 5.7 multisite	7m 14s
PHP 7.0 / MySQL 5.7	7m 25s
PHP 7.4 / MySQL 5.7 with memcached	6m 55s
PHP 8.0 / MySQL 5.7	6m 49s
PHP 8.1 / MySQL 5.7 multisite	6m 50s
PHP 8.1 / MySQL 5.7	6m 41s
PHP 7.4 / MySQL 5.7 multisite	6m 56s
Slack Notifications	-1s
Failed workflow tasks	-1s
	1h 34m 28s