Cherry pick fixes from main to release#15461

Merged

karthiknadig merged 3 commits intomicrosoft:release-2021.02from

karthiknadig:cherry1

Feb 19, 2021

Commits on Feb 19, 2021

Ensure pyenv virtual envs are not skipped when in discovery experiment (#15451)
karthiknadig
committed
Register Jedi regardless of what language server is configured (#15452)

Kartik Raj
authored and
karthiknadig
committed
Only call component adapter behind the discovery experiment (#15459)

Kartik Raj
authored and
karthiknadig
committed