Fix up logic for delaying sending read receipts over federation. (#17… #4054

Job	Run time
changes	1s
check-lockfile	7s
lint-crlf	4s
lint-newsfile	0s
check-schema-delta	42s
Typechecking	1m 33s
check-sampleconfig	49s
lint	19s
lint-clippy	2m 28s
lint-clippy-nightly	2m 25s
lint-pydantic	50s
lint-rustfmt	2m 13s
lint-readme	11s
linting-done	1s
calculate-test-jobs	8s
trial-olddeps	6m 51s
portdb (3.9, 11)	3m 15s
complement (monolith, SQLite)	13m 41s
portdb (3.13, 17)	3m 20s
trial-pypy	0s
complement (monolith, Postgres)	14m 41s
complement (workers, Postgres)	21m 42s
cargo-bench	0s
cargo-test	0s
sytest (bullseye)	9m 9s
trial (3.9, sqlite, all)	6m 7s
sytest (bullseye, postgres)	10m 38s
trial (3.10, sqlite, all)	12m 10s
sytest (bullseye, multi-postgres, workers)	13m 51s
trial (3.11, sqlite, all)	10m 28s
sytest (bullseye, multi-postgres, workers, asyncio)	19m 15s
trial (3.12, sqlite, all)	5m 40s
sytest (bullseye, asyncio)	10m 3s
trial (3.13, sqlite, all)	9m 52s
sytest (bullseye, postgres, asyncio)	12m 23s
trial (3.9, postgres, 11, all)	14m 2s
sytest (testing, postgres)	11m 12s
trial (3.13, postgres, 17, all)	15m 4s
trial (3.9, sqlite)	5m 21s
export-data	5m 18s
tests-done	1s
	4h 5m 55s

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