Factor out common notify read code #70922

Job	Run time
diff	7s
license-check	1m 15s
release-notes-check	16s
move-auto-formatter-ci-test	0s
test (ubuntu-ghcloud)	24m 26s
simtest	16m 24s
test-extra (ubuntu-ghcloud)	16m 10s
windows-build (windows-ghcloud)	13m 16s
move-test	0s
test	0s
clippy	9m 48s
rustfmt	17s
test-extra	0s
cargo-deny (advisories, licenses, bans, ...)	3m 0s
graphql-rpc	20m 40s
cutting a new execution layer	1m 39s
	1h 47m 18s

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