Sliding Sync: Add cache to `get_tags_for_room(...)` (#17730) #3296

Job	Run time
changes	1s
check-lockfile	4s
lint-crlf	4s
lint-newsfile	0s
lint	19s
check-schema-delta	42s
Typechecking	1m 12s
check-sampleconfig	40s
lint-pydantic	47s
lint-clippy-nightly	18s
lint-clippy	17s
lint-readme	9s
lint-rustfmt	15s
linting-done	1s
calculate-test-jobs	7s
portdb (3.8, 11)	3m 12s
trial-olddeps	8m 5s
portdb (3.11, 15)	3m 10s
trial-pypy	0s
cargo-test	0s
complement (monolith, SQLite)	12m 36s
cargo-bench	0s
complement (monolith, Postgres)	12m 56s
complement (workers, Postgres)	19m 15s
sytest (focal)	8m 25s
trial (3.8, sqlite, all)	5m 49s
sytest (focal, postgres)	10m 11s
trial (3.9, sqlite, all)	5m 26s
sytest (focal, multi-postgres, workers)	13m 47s
sytest (focal, multi-postgres, workers, asyncio)	18m 24s
trial (3.10, sqlite, all)	5m 10s
sytest (focal, asyncio)	10m 11s
trial (3.11, sqlite, all)	4m 13s
sytest (focal, postgres, asyncio)	11m 36s
trial (3.12, sqlite, all)	4m 47s
sytest (testing, postgres)	11m 2s
trial (3.8, postgres, 11, all)	12m 53s
trial (3.12, postgres, 16, all)	12m 10s
trial (3.8, sqlite)	5m 37s
export-data	2m 12s
tests-done	2s
	3h 26m 5s

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