matrix: Remove retention policy backfill code #11813

Job	Run time
Check which packages changed	0s
AI bot Tests	43s
Boxel Icons ensure raw icon changes only	1m 16s
Boxel Motion Tests	1m 7s
Boxel UI ensure raw icon changes only	42s
Boxel UI Tests	3m 14s
Boxel Tools VS Code Extension package	2m 15s
Matrix Client Tests (1, 12)	11m 44s
Matrix Client Tests (10, 12)	8m 27s
Matrix Client Tests (11, 12)	8m 24s
Matrix Client Tests (12, 12)	9m 36s
Matrix Client Tests (2, 12)	10m 28s
Matrix Client Tests (3, 12)	11m 8s
Matrix Client Tests (4, 12)	9m 30s
Matrix Client Tests (5, 12)	10m 5s
Matrix Client Tests (6, 12)	10m 17s
Matrix Client Tests (7, 12)	9m 57s
Matrix Client Tests (8, 12)	10m 36s
Matrix Client Tests (9, 12)	8m 39s
Realm Server Tests (auth-client-test.ts)	5m 6s
Realm Server Tests (billing-test.ts)	5m 13s
Realm Server Tests (indexing-test.ts)	6m 3s
Realm Server Tests (index-query-engine-test.ts)	5m 25s
Realm Server Tests (index-writer-test.ts)	5m 9s
Realm Server Tests (loader-test.ts)	5m 23s
Realm Server Tests (module-syntax-test.ts)	5m 5s
Realm Server Tests (queue-test.ts)	5m 21s
Realm Server Tests (realm-endpoints-test.ts)	9m 39s
Realm Server Tests (server-endpoints-test.ts)	7m 43s
Realm Server Tests (virtual-network-test.ts)	5m 6s
Deploy boxel to staging	0s
Merge Matrix reports and publish	46s
	3h 14m 7s

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