Roll forward beta branch to 2020.2
Roll forward beta branch to 2020.2

We fixed the installation issues and can now continue with using 2020.2 for the beta branch.

PiperOrigin-RevId: 344276123

bazelbuild/intellij,bazelbuild/intellij,bazelbuild/intellij,bazelbuild/intellij,bazelbuild/intellij,bazelbuild/intellij,bazelbuild/intellij