Introduce empty "toolchain_category" rule for labels that will be used as categories of toolchains for the purpose of toolchain selection. Up to now, we've used the native toolchain_type rule for this purpose. That rule depends on a number of configuration fragments that supply build variables - we don't want toolchains to need to depend on those fragments as well. E.g. toolchain_type depends on JvmConfiguration, but we would like toolchains to work with --experimental_disable_jvm. PiperOrigin-RevId: 168577759
{Fast, Correct} - Choose two
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