KIC 2.0 - 2.x integration tests also set up to test 1.x

[shaneutt]

The Kong Kubernetes Testing Framework (KTF) was created to provide integration testing for Kong Kubernetes components using Go tests.

The purpose of this issue is to migrate our existing bash tests to the KTF in main in preparation for our eventual transition onto the new architecture demonstrated with railgun/.

These tests should pass on both v1.x AND v2.0 prior to v2.0 release to help demonstrate protection against regressions.

[mflendrich]

Pending team review.

[shaneutt]

blocked on https://github.com/Kong/keps/issues/13

[shaneutt]

now blocked on the following:

• add testing generators kubernetes-testing-framework#3
• KIC 2.0 Integration Test Happy Path for v1.Ingress #1102

[shaneutt]

I'm not sure this is going to resemble a "port" of the code when I implement it: I'm intending to make the testing framework run-able with either controller manager (v1.x or v2.x) and then have CI run them BOTH on any PR, the intention is from now until 2.0 all tests will test both controllers, so that until we release we have higher assurance that they're (ultimately) functioning the same way and all new tests immediately check v1.x vs v2.x simoltaneously.