* feat: migrate from libcompose to compose-go
libcompose has been deprecated since summer 2021 in favor of https://github.com/compose-spec/compose-go.
Kompose should now be able to load all versions of compose.
* chore: replace golint with staticcheck
golint has been deprecated. Recommended replacement is staticcheck.
* fix: make the out flag print to one file using seperator
* fix: comment an unused function
* fix: update test script
* fix: update output k8s
* fix: update the json output error condition
* fix: update envvars interpolation tests
* chore: update e2e tests to support yaml generation instead of JSON format
* fix: update e2e tests according to ci environment
* fix: apply PR changes
