[Compiler-v2] Track live var info in spec blocks by default #67231

Job	Run time
file_change_determinator	11s
rust-consensus-only-smoke-test	0s
rust-consensus-only-unit-test	0s
rust-doc-tests	0s
rust-unit-tests	0s
rust-lints	4m 23s
rust-cargo-deny	1m 39s
rust-check-merge-base	1m 52s
general-lints	26s
rust-smoke-tests	0s
rust-cryptohasher-domain-separation-check	0s
rust-targeted-unit-tests	17m 6s
rust-build-cached-packages	0s
	25m 37s

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