## Changes
Enable gofumpt and goimports in golangci-lint and apply autofix.
This makes 'make fmt' redundant, will be cleaned up in follow up diff.
## Tests
Existing tests.
## Changes
Only clusters with their source attribute equal to `UI` or `API` should
be presented in the dropdown.
## Tests
Unit test and manual confirmation.
Denis Bilenko
Andrew Nester
Pieter Noordhuis
Serge Smertin