sync: Send already connected peers to new subscribers #16899

Job	Run time
check-dependency-rules	9s
check-markdown	15s
check-workspace	16s
check-fail-ci	10s
check-readme	2m 54s
preflight / preflight	42s
preflight / ci-versions	1m 0s
fmt	1m 10s
check-rust-feature-propagation	1m 32s
test-rust-features	1m 32s
check-toml-format	1m 9s
check-umbrella	1m 33s
All quick checks passed	1s
	12m 23s

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