Add option to disable fetching managed toolchains #4425
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Adds a toolchain preference (introduced in #4424) to only allow installed managed toolchains.
This might not actually belong in the toolchain preferences? i.e. the way it's currently spelled there's no option for "prefer system but allow installed managed toolchains". Enabling or disabling fetches could be totally independent of the toolchain preference. I'm on the fence on what the correct approach is. Regardless, this functionality is important and this is a good starting point for discussion on how to expose it.