Remove kiali from pre-gitlab-gke overlay kustomization

What

Remove kiali from the pre-gitlab-gke kustomization.yaml file.

Why

reliablity-overlays is still referring to the kiali kustomization folder, therefore is failing to reconcile:

reliability-overlays                      	main@sha1:f876619e	False    	False	kustomize build failed: accumulating resources: accumulation err='accumulating resources from 'kiali/': open /tmp/kustomization-560367313/overlays/gke/gitlab-pre/us-east1/pre-gitlab-gke/kiali: no such file or directory': must build at directory: not a valid directory: evalsymlink failure on '/tmp/kustomization-560367313/overlays/gke/gitlab-pre/us-east1/pre-gitlab-gke/kiali' : lstat /tmp/kustomization-560367313/overlays/gke/gitlab-pre/us-east1/pre-gitlab-gke/kiali: no such file or directory

Related Issue: https://gitlab.com/gitlab-com/gl-infra/reliability/-/issues/24157