ci
: Improve and speed up setup steps using github actions
#4771
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This pr speeds up installation of cargo tools in the ci by installing pre-built binaries with
taiki-e/install-action
where possible instead of building them from source withcargo install
.Setting up the rust toolchain with
dtolnay/rust-toolchain
simplifies and shortens the installation of the rust toolchain. This action is just used to outsource this setup step, so we don't have to care about it.Some explicitly set environment variables which are already set by github actions are removed.