* Convert the bug-report template to issue form

* Convert the enchancement issue template to form

* Convert "Failing Test" template to issue form

* github: Remove support request template, direct to slack instead

The label triage/support has been reclassified as kind/support. The
kind/* family of labels makes more logical sense, as they describe the
"kind" of thing an issue or PR is.

For more information, see the announcement email:
https://groups.google.com/g/kubernetes-dev/c/YcaJpsjjLKw/m/i15cLLx5CAAJ