feat(test): introduce a test that executes the validatingwebhook

[diranged]

Closes #167.

In #151 we updated some libraries and we missed the fact that kubernetes-sigs/controller-runtime#2134 removed the InjectDecoder call entirely. This PR implements a live test of the CONNECT functionality, as well as fixes for the decoder.

[coveralls]

Pull Request Test Coverage Report for Build 5882619350

• 1 of 2 (50.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.07%) to 46.158%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
internal/controllers/podwatcher/types.go	0	1	0.0%

Totals
Change from base Build 5862057232:	0.07%
Covered Lines:	967
Relevant Lines:	2095

---

💛 - Coveralls

[diranged]

This test fails as-expected:

oz-controller PodAccessTemplate / PodAccessRequest [It] Should allow CONNECTing to the Pod
/Users/diranged/go/src/github.com/diranged/oz/internal/testing/e2e/e2e_test.go:205

  [FAILED] Unexpected error:
      <*errors.errorString | 0x1400059f440>: 
      kubectl exec -ti -n oz-system deployment-example-35f6c845 -- whoami failed with error: (exit status 1) Unable to use a TTY - input is not a terminal or the right kind of file
      Error from server (InternalError): Internal error occurred: failed calling webhook "vpod.kb.io": failed to call webhook: Post "https://oz-webhook-service.oz-system.svc:443/watch-v1-pod?timeout=10s": EOF
      
      {
          s: "kubectl exec -ti -n oz-system deployment-example-35f6c845 -- whoami failed with error: (exit status 1) Unable to use a TTY - input is not a terminal or the right kind of file\nError from server (InternalError): Internal error occurred: failed calling webhook \"vpod.kb.io\": failed to call webhook: Post \"https://oz-webhook-service.oz-system.svc:443/watch-v1-pod?timeout=10s\": EOF\n",
      }
  occurred
  In [It] at: /Users/diranged/go/src/github.com/diranged/oz/internal/testing/e2e/e2e_test.go:232 @ 08/16/23 06:45:04.167

I'll be merging this as is, to intentionally break main... then I will fix main.d