Consolidate Helm Integration Testing Strategy

[sabre1041]

Currently, new capabilities have been added to test the Helm charts associated with operators. Included to facilitate the testing are a series of supporting Helm charts. These charts have been included in each of the operator repositories.

In order to simplify the configuration and to consolidate the work, the following enhancements can be implemented:

1. Move the charts from individual repositories and store them within the CoP Helm Charts repository
2. Update each chart to reference the remote repository

[trevorbox]

Parameterize the ingress object to support any port needed per integration test (https://github.com/redhat-cop/vault-config-operator/blob/main/integration/helm/ingress-nginx/templates/ingress-vault.yaml#L1-L16), and publish the chart in CoP Helm Charts repository. Keep the curl request in individual Makefiles for kind ingress-nginx, but standardize it across the operators (see https://github.com/redhat-cop/vault-config-operator/blob/main/Makefile#L112).

Secondly, a chart for prometheus https://github.com/redhat-cop/vault-config-operator/tree/main/integration/helm/prometheus-rbac with a dependency on https://prometheus-community.github.io/helm-charts should also get published to CoP Helm Charts repository

@sabre1041 this sound right? anything else?