explore switching from RobotFramework to another test runner for test runs

[hellt]

We use RobotFramework as a test framework for the integration tests driven through rf-run.sh script.

It might be more appealing to use a native Go package to run integration tests (or a less heavy test engine), considering we don't have complicated test runs.
In this tweet a few modern Go native test runners have been suggested, of which I marked the following:

• https://github.com/gotestyourself/gotest.tools (tweet)
• testcript
• venom