Fix up logic for delaying sending read receipts over federation. #3942

Job	Run time
lint-newsfile	33s
lint-newsfile	33s
lint-crlf	7s
lint-crlf	7s
changes	2s
changes	2s
check-lockfile	5s
check-lockfile	5s
check-sampleconfig	50s
check-sampleconfig	50s
check-schema-delta	38s
check-schema-delta	38s
lint-clippy	0s
lint-clippy	0s
lint	28s
lint	28s
Typechecking	1m 48s
Typechecking	1m 48s
lint-pydantic	50s
lint-pydantic	50s
lint-clippy-nightly	0s
lint-clippy-nightly	0s
lint-readme	0s
lint-readme	0s
lint-rustfmt	0s
lint-rustfmt	0s
linting-done	5s
linting-done	5s
calculate-test-jobs	9s
calculate-test-jobs	9s
complement (monolith, SQLite)	14m 37s
complement (monolith, SQLite)	14m 37s
cargo-test	0s
cargo-test	0s
cargo-bench	0s
cargo-bench	0s
complement (monolith, Postgres)	15m 22s
complement (monolith, Postgres)	15m 24s
complement (workers, Postgres)	23m 59s
complement (workers, Postgres)	23m 59s
portdb (3.9, 11)	3m 8s
portdb (3.9, 11)	3m 8s
trial-olddeps	6m 56s
trial-olddeps	6m 56s
trial-pypy	0s
trial-pypy	0s
portdb (3.13, 17)	3m 28s
portdb (3.13, 17)	3m 28s
trial (3.9, sqlite, all)	5m 50s
trial (3.9, sqlite, all)	5m 50s
sytest (bullseye)	8m 57s
sytest (bullseye)	8m 28s
trial (3.9, postgres, 11, all)	14m 1s
trial (3.9, postgres, 11, all)	14m 1s
sytest (bullseye, postgres)	10m 29s
sytest (bullseye, postgres)	10m 29s
sytest (bullseye, multi-postgres, workers)	13m 28s
sytest (bullseye, multi-postgres, workers)	13m 28s
trial (3.9, sqlite)	5m 17s
trial (3.9, sqlite)	5m 17s
sytest (bullseye, multi-postgres, workers, asyncio)	19m 1s
sytest (bullseye, multi-postgres, workers, asyncio)	19m 1s
export-data	2m 10s
export-data	2m 10s
tests-done	4s
tests-done	2s
	5h 4m 15s

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