toolchains: Run listing tasks on background thread (cherry-pick #21414) #21420
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Cherry-picked toolchains: Run listing tasks on background thread (#21414)
Potentially fixes #21404
This is a speculative fix, as while I was trying to repro this issue
I've noticed that introducing artificial delays in ToolchainLister::list
could impact apps responsiveness. These delays were essentially there to
stimulate PET taking a while to find venvs.
Release Notes:
virtual environments