fix(acp-next): add config switch fast paths (#29255) #106

Job	Run time
compute-hash (aarch64-darwin, macos-latest)	10m 59s
compute-hash (aarch64-linux, blacksmith-4vcpu-ubuntu-2404-arm)	1d 0h 0m 0s
compute-hash (x86_64-darwin, macos-15-intel)	15m 24s
compute-hash (x86_64-linux, blacksmith-4vcpu-ubuntu-2404)	1d 0h 0m 1s
update-hashes	0s
	2d 0h 26m 24s

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