Add `--no-set` to install commands, fixes #330

This also slightly changes the default for 'ghcup install cabal/stack/hls'... instead of only setting the installed version if it's the latest, we always set it. So the default is --set.

For GHC, the default is --no-set.

added 1 commit

• 604a6fc9 - Fix bug with isolated installation of not previously installed versions

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merged