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Backport: Skip pull_request triggered runs in private repos - 5.8 Branch #65331

Job	Run time
PHP 5.6 / PHP 5.6 / Multisite slow tests	3m 7s
PHP 5.6 / PHP 5.6 / Single Site	7m 56s
PHP 8.0 / PHP 8.0 / Multisite	5m 38s
PHP 5.6 / PHP 5.6 / Multisite	9m 9s
PHP 7.4 / PHP 7.4 / Single Site with memcached	5m 33s
PHP 7.4 / PHP 7.4 / Multisite	5m 36s
PHP 5.6 / PHP 5.6 / Single Site slow tests	2m 59s
PHP 8.0 / PHP 8.0 / Single Site	4m 58s
PHP 7.4 / PHP 7.4 / Single Site	4m 37s
PHP 7.4 / PHP 7.4 / Multisite with memcached	5m 56s
PHP 7.0 / PHP 7.0 / Single Site	5m 37s
PHP 7.0 / PHP 7.0 / Multisite	5m 46s
Failed workflow tasks	0s
Slack Notifications	0s
	1h 6m 52s