Remove local .GOPATH

What does this MR do?

This MR removes the usage of a local .GOPATH folder. This is an old trick we implemented prior to go mod being available.

TODO

• [-] I added the Changelog trailer (e.g. Changelog: added) to the commits that need to be included in the changelog
• [-] I added unit tests or they are not required
• [-] I added acceptance tests or they are not required
• [-] I added documentation (or it's not required)
• [-] I followed code review guidelines
• [-] I followed Go Style guidelines