Added a labs flag for CAPTCHA #15420

Job	Run time
Setup	59s
i18n	36s
Lint	48s
Admin tests - Chrome	0s
Browser tests	0s
Performance tests	0s
Unit tests (Node 18.12.1)	1m 29s
Unit tests (Node 20.11.1)	1m 36s
Admin-X Settings tests	5m 9s
Regression tests (Node 20.11.1, mysql8)	3m 1s
Database tests (Node 18.12.1, mysql8)	6m 12s
Regression tests (Node 20.11.1, sqlite3)	1m 40s
Database tests (Node 20.11.1, mysql8)	6m 10s
Comments-UI tests	0s
Ghost-CLI tests	3m 54s
Database tests (Node 20.11.1, sqlite3)	3m 24s
Signup-form tests	0s
Publish @tryghost/admin-x-activitypub	0s
All required tests passed or skipped	1s
Coverage	0s
Canary	0s
	34m 59s

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