ci: Add playground feature flag for host previews #12086

Job	Run time
Check which packages changed	0s
AI bot Tests	50s
Boxel Icons ensure raw icon changes only	1m 14s
Boxel Motion Tests	1m 12s
Boxel UI ensure raw icon changes only	50s
Boxel UI Tests	3m 22s
Boxel Tools VS Code Extension package	2m 9s
Matrix Client Tests (1, 12)	11m 50s
Matrix Client Tests (10, 12)	8m 0s
Matrix Client Tests (11, 12)	10m 8s
Matrix Client Tests (12, 12)	10m 14s
Matrix Client Tests (2, 12)	12m 51s
Matrix Client Tests (3, 12)	11m 12s
Matrix Client Tests (4, 12)	13m 41s
Matrix Client Tests (5, 12)	11m 20s
Matrix Client Tests (6, 12)	11m 35s
Matrix Client Tests (7, 12)	11m 21s
Matrix Client Tests (8, 12)	11m 17s
Matrix Client Tests (9, 12)	9m 39s
Realm Server Tests (auth-client-test.ts)	5m 6s
Realm Server Tests (billing-test.ts)	5m 33s
Realm Server Tests (indexing-test.ts)	5m 50s
Realm Server Tests (index-query-engine-test.ts)	5m 41s
Realm Server Tests (index-writer-test.ts)	5m 22s
Realm Server Tests (loader-test.ts)	6m 33s
Realm Server Tests (module-syntax-test.ts)	5m 6s
Realm Server Tests (queue-test.ts)	5m 16s
Realm Server Tests (realm-endpoints-test.ts)	10m 5s
Realm Server Tests (server-endpoints-test.ts)	7m 49s
Realm Server Tests (virtual-network-test.ts)	5m 6s
Deploy boxel to staging	0s
Merge Matrix reports and publish	47s
	3h 30m 59s

Provide feedback