Mixed mode splicing #21206

Job	Run time
check_docs	3m 45s
fuzz	1h 6m 22s
rustfmt	14s
benchmark	1m 50s
ext-test	5m 43s
linting	2m 26s
build-tx-sync (ubuntu-latest, beta)	4m 42s
build (self-hosted, beta)	3m 19s
check_release	2m 50s
build-tx-sync (ubuntu-latest, 1.75.0)	5m 37s
build-tx-sync (macos-latest, beta)	7m 24s
build-tx-sync (ubuntu-latest, stable)	4m 44s
build (self-hosted, 1.75.0)	3m 35s
build (self-hosted, stable)	3m 17s
build-tx-sync (macos-latest, stable)	7m 56s
build (windows-latest, stable)	7m 2s
build (macos-latest, stable)	6m 30s
build-tx-sync (macos-latest, 1.75.0)	8m 54s
build (macos-latest, 1.75.0)	6m 17s
coverage	4m 8s
	2h 36m 35s

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