Add additional manifest checks to detect missing CRDs & CRs

[joelsmith]

This PR has three parts:

1. Add additional PR checks to make sure that every CRD is listed in the CRD kustomize.yaml file and that every CRD also has a sample CR for each of its API versions and is similarly listed in the kustomize.yaml file for sample CR files.
2. Add missing sample CRs, CRDs and references.
3. Update existing sample CR for triggerauthentication which had the old API group of keda.k8s.io instead of the new keda.sh

Checklist

• I have verified that my change is according to the deprecations & breaking changes policy
• Tests have been added
• Changelog has been updated and is aligned with our changelog requirements
• Commits are signed with Developer Certificate of Origin (DCO - learn more)

Fixes #5920

[joelsmith]

The check seems to be working. For example: https://github.com/kedacore/keda/actions/runs/9708520106/job/26795477554?pr=5921

Run make verify-manifests
./hack/verify-manifests.sh
ERROR: CR config/samples/eventing_v1alpha1_cloudeventsource.yaml is not listed in the resources section of config/samples/kustomization.yaml
ERROR: CRD config/crd/bases/keda.sh_clustertriggerauthentications.yaml does not have a sample CR config/samples/keda_v1alpha1_clustertriggerauthentication.yaml
ERROR: CR config/samples/keda_v1alpha1_clustertriggerauthentication.yaml is not listed in the resources section of config/samples/kustomization.yaml
make[1]: Entering directory '/__w/keda/keda'
...
./hack/../config up to date.
Check failed due to previous errors. See output above
make: *** [Makefile:1[5](https://github.com/kedacore/keda/actions/runs/9708520106/job/26795477554?pr=5921#step:12:6)3: verify-manifests] Error 1
Error: Process completed with exit code 2.

So now I need to add another commit to add the missing manifests and references.

Edit: commit 2 added and now the new test passes without errors.

[zroubalik]

LGTM, thanks

[zroubalik]

/run-e2e internal
Update: You can check the progress here

[joelsmith]

Sorry for the last-minute change. I just noticed that the sample CR I copied (triggerauthentication) had an API group of keda.k8s.io instead of keda.sh so I fixed the new clustertriggerauthentication one and also fixed the existing triggerauthentication.

[tomkerkhove]

Thank you!