Switch to gotestsum

[negz]

What problem are you facing?

We currently use https://github.com/jstemmer/go-junit-report to create Sonobuoy compatible junit reports from our tests. It seems like there are several known issues with go-junit-report that are languishing; including that it can't handle cmp output correctly.

How could conformance help solve your problem?

We could switch to https://github.com/gotestyourself/gotestsum/, which appears to be the new hotness (and better supported).

[negz]

Note - go-junit-report seems to be working well enough at the moment so this is a lower priority.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.