Run a parallel pre-check before updating toolchains#4752

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FranciscoTGouveia wants to merge 3 commits intorust-lang:mainfrom

FranciscoTGouveia:update-performance

Commits on Mar 17, 2026

fix(toolchain): extract manifest fetching out of `show_dist_version()`
FranciscoTGouveia
committed
feat(install): add `install_with_manifest()` to reuse pre-fetched manifests
FranciscoTGouveia
committed
feat(toolchain): run a pre-check before updating all toolchains
FranciscoTGouveia
committed