sync: Send already connected peers to new subscribers #16951

Job	Run time
check-dependency-rules	8s
check-fail-ci	12s
check-markdown	12s
check-readme	3m 10s
check-workspace	16s
preflight / preflight	44s
preflight / ci-versions	52s
check-toml-format	1m 1s
fmt	1m 7s
check-rust-feature-propagation	1m 57s
test-rust-features	1m 52s
check-umbrella	2m 10s
All quick checks passed	1s
	13m 42s

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