sync: Send already connected peers to new subscribers #16901

Job	Run time
check-fail-ci	11s
check-dependency-rules	8s
check-markdown	16s
check-readme	3m 13s
check-workspace	17s
preflight / preflight	42s
preflight / ci-versions	57s
fmt	1m 16s
check-rust-feature-propagation	1m 58s
test-rust-features	2m 0s
check-toml-format	1m 5s
check-umbrella	2m 13s
All quick checks passed	1s
	14m 17s

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