sync: Send already connected peers to new subscribers #16900

Job	Run time
check-dependency-rules	9s
check-fail-ci	9s
check-markdown	11s
check-readme	3m 6s
check-workspace	12s
preflight / preflight	43s
preflight / ci-versions	1m 10s
check-rust-feature-propagation	1m 58s
check-toml-format	1m 9s
check-umbrella	2m 18s
fmt	1m 15s
test-rust-features	2m 12s
All quick checks passed	1s
	14m 33s

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