feat(discovery): implement All Namespaces discovery

[andrewazores]

Fixes #212
Depends on cryostatio/cryostat#725

To test:

1. cd cryostat-operator
2. for ns in apps1 apps2; do oc new-project $ns ; make sample_app ; done
3. oc new-project test
4. cd cryostat-helm
5. helm install cryostat --set core.image.repository=quay.io/andrewazores/cryostat --set core.image.tag=k8s-all-namespaces-7 cryostat ./charts/cryostat this is an image built from feat(k8s): implement wildcard All Namespaces discovery cryostat#725
6. Follow post-installation steps for port forwarding, then open Cryostat UI
7. Go to Topology and ensure that two sample applications, in apps1 and apps2 namespaces, are discovered

[tthvo]

I agree with cryostatio/cryostat-operator#976 (comment) here, this might introduce more elevated access than intended.

[Josh-Matsuoka]

Needs to be rebased, there are a few conflicts to resolve

[tthvo]

nit: I think if all-namespace mode is enabled, we can skip generating namespaced role and rolebing manifests, right?

[tthvo]

Looks good to me!

I guess we will need to adjust rule for clusterrole after cryostatio/cryostat#740 :D