matrix: Remove retention policy backfill code #13185

Job	Run time
Check which packages changed	0s
Boxel Icons ensure raw icon changes only	1m 19s
AI bot Tests	48s
Boxel Motion Tests	1m 4s
Boxel UI ensure raw icon changes only	47s
Boxel UI Tests	3m 13s
Boxel Tools VS Code Extension package	2m 16s
Matrix Client Tests (1, 12)	9m 46s
Matrix Client Tests (10, 12)	7m 18s
Matrix Client Tests (12, 12)	10m 8s
Matrix Client Tests (11, 12)	9m 33s
Matrix Client Tests (2, 12)	11m 6s
Matrix Client Tests (3, 12)	9m 59s
Matrix Client Tests (4, 12)	10m 9s
Matrix Client Tests (5, 12)	9m 45s
Matrix Client Tests (6, 12)	10m 6s
Matrix Client Tests (7, 12)	9m 43s
Matrix Client Tests (8, 12)	9m 58s
Matrix Client Tests (9, 12)	10m 39s
Realm Server Tests (billing-test.ts)	5m 17s
Realm Server Tests (auth-client-test.ts)	5m 12s
Realm Server Tests (indexing-test.ts)	5m 55s
Realm Server Tests (index-query-engine-test.ts)	5m 31s
Realm Server Tests (index-writer-test.ts)	5m 10s
Realm Server Tests (loader-test.ts)	5m 31s
Realm Server Tests (module-syntax-test.ts)	5m 5s
Realm Server Tests (queue-test.ts)	5m 15s
Realm Server Tests (realm-endpoints-test.ts)	13m 28s
Realm Server Tests (server-endpoints-test.ts)	7m 56s
Realm Server Tests (virtual-network-test.ts)	5m 12s
Merge Matrix reports and publish	52s
Deploy boxel to staging	0s
	3h 18m 1s

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