rename kiali_vars to kiali_vars_remove so it is unique to the remove role

[jmazzitelli]

fixes: kiali/kiali#6199

[jmazzitelli]

The basic test to see this work is to create a Kiali CR with spec.version set to X. And then after Kiali is deployed, change the Kiali CR's spec.version to Y (where X and Y are valid spec.versions like default, v1.65, etc). This should no longer fail. The test will update the Kiali CR 3 times to see that we can move spec.version from default to v1.65 to v1.57 then back to default. This is necessary to test the changes made in this PR.

Detailed test procedures:

1. Install a kubernetes cluster (doesn't matter which - OpenShift, minikube, whatever - I will be using minikube in these test instructions).
2. Install Istio
3. Pull this operator PR into your dev environment
4. Build and push the server and operator container images to your cluster: make -e CLUSTER_TYPE=minikube build build-ui cluster-push
5. Deploy the operator to the cluster: make -e CLUSTER_TYPE=minikube operator-create
6. Ensure the operator is running now: kubectl get pods -n kiali-operator

At this point, we are ready to start creating and modifying the Kiali CR - we will create an initial CR and then modify it three times, changing the spec.version each time. After each time the Kiali CR is touched, wait for the Kiali server pod to start (in a separate window, run kubectl get pods -n istio-system -l app=kiali -w and you'll see the server pod come up and down as the operator processes the CR each time). If you see the server pod running after the operator finishes reconciling the CR, the test is passing. You can also check the operator logs - you should no longer see the errors that were happening before.

7. Create a Kiali CR with spec.version of default using make: make -e CLUSTER_TYPE=minikube -e KIALI_CR_SPEC_VERSION=default kiali-create
8. Update the Kiali CR with spec.version of v1.65 using make: make -e CLUSTER_TYPE=minikube -e KIALI_CR_SPEC_VERSION=v1.65 kiali-create
9. Update the Kiali CR with spec.version of v1.57 using make: make -e CLUSTER_TYPE=minikube -e KIALI_CR_SPEC_VERSION=v1.57 kiali-create
10. Update the Kiali CR with spec.version of default using make: make -e CLUSTER_TYPE=minikube -e KIALI_CR_SPEC_VERSION=default kiali-create

[jmazzitelli]

Do not merge this until this PR is merged: #654
I found an odd conflict in my PR here that ultimately uncovered this problem. I want that fixed by merging that PR, then I need to rebase this PR on master (which will likely result in a similar conflict that I will have to reconcile).

[jmazzitelli]

OK.. the v1.65 role has been fixed in master and this PR has been rebased with conflicts resolved. This is ready for review/approval/merge.

[jshaughn]

All test steps passed, changed kiali spec version 3 times, operator reconciled with no errors each time and kiali pod restarted without issues.