Faster initial sync #5790

Job	Run time
sync-test-macos (macos-13)	4m 6s
sync-test-macos (macos-13)	7m 45s
sync-test-macos (macos-14, -target arm64-apple-macos-11)	3m 55s
sync-test-macos (macos-14, -target arm64-apple-macos-11)	7m 16s
sync-test-ubuntu-asan	24m 21s
sync-test-ubuntu-asan	24m 21s
sync-test-ubuntu-msan	33m 1s
sync-test-ubuntu-msan	33m 1s
sync-test-ubuntu-tsan	33m 4s
sync-test-ubuntu-tsan	33m 4s
sync-test-ubuntu-ubsan	21m 6s
sync-test-ubuntu-ubsan	21m 6s
sync-test-windows-debug-asan	26m 31s
sync-test-windows-debug-asan	26m 31s
sync-test-windows-leaks	27m 45s
sync-test-windows-leaks	27m 45s
	5h 54m 38s

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