Eric Huss 8bb62310e5 cargo_test CI macro: add requires_rustup_stable
This adds the `requires_rustup_stable` option to the cargo_test macro to
require `rustup` to exist, and for the `stable` toolchain to be
installed.

It is required that stable be installed in Cargo's CI. On a developer
machine, the tests will be ignored if rustup is not installed. It will
also be ignored on rust-lang/rust's CI since it does not have rustup.
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