matrix: Add room retention policy #11747

Job	Run time
Check which packages changed	0s
AI bot Tests	47s
Boxel Motion Tests	1m 6s
Boxel UI ensure raw icon changes only	43s
Boxel Icons ensure raw icon changes only	1m 15s
Boxel UI Tests	3m 18s
Boxel Tools VS Code Extension package	2m 16s
Realm Server Tests (auth-client-test.ts)	4m 14s
Realm Server Tests (billing-test.ts)	4m 12s
Realm Server Tests (indexing-test.ts)	4m 20s
Realm Server Tests (index-query-engine-test.ts)	4m 13s
Realm Server Tests (index-writer-test.ts)	4m 12s
Realm Server Tests (loader-test.ts)	4m 18s
Realm Server Tests (module-syntax-test.ts)	4m 7s
Realm Server Tests (queue-test.ts)	4m 15s
Realm Server Tests (virtual-network-test.ts)	4m 12s
Realm Server Tests (realm-server-test.ts)	4m 7s
Matrix Client Tests (10, 12)	5m 9s
Matrix Client Tests (1, 12)	5m 13s
Matrix Client Tests (12, 12)	5m 9s
Matrix Client Tests (11, 12)	5m 5s
Matrix Client Tests (2, 12)	7m 3s
Matrix Client Tests (3, 12)	5m 11s
Matrix Client Tests (4, 12)	5m 19s
Matrix Client Tests (5, 12)	5m 12s
Matrix Client Tests (6, 12)	5m 38s
Matrix Client Tests (7, 12)	5m 3s
Matrix Client Tests (8, 12)	5m 15s
Matrix Client Tests (9, 12)	5m 39s
Deploy boxel to staging	0s
Merge Matrix reports and publish	1m 1s
	1h 57m 32s

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