Convert shell commands that call oc into k8s module tasks

[dwinchell]

Stop doing this:

• name: Clean up remaining resources shell: | oc delete -n {{ tssc_namespace }} KeycloakUser,KeycloakClient --all

Do it like this:

• name: Clean up remaining resources k8s: figure: this stuff: out

Why?

1. The shell commands that run during the finalizer fail when things are missing, which causes the finalizer to fail, which results in other resources not being cleaned up
2. We use the k8s module for most changes to ocp resources and want to be consistent