tests: run dynamic tests against kind broken?

[acpana]

Circling back on our dynamic testing run-tests flag. The docs currently state that:

Set [test-target] to the kind (in all lower-case letters) in the following command to run all the tests for your resource.

https://github.com/GoogleCloudPlatform/k8s-config-connector/blob/59a3462509b854bbb98ae0bfa47d9044cf1b4d3c/README.NewResourceFromTerraform.md#run-tests

But @ziyue-101's experience and mine is that kind may not be written into the basic test names (the leaf directories) that the regex is matched against. More on this structure as an edge case is elaborated on this PR: #1424

We can update our README and/or use some of the ideas in the PR to make matching against kind work in those edge cases.