Create templates `tests/e2e/sample-applications`

To avoid duplication, we need to create OpenShift Templates for tests/e2e/sample-applications. This will also make it easier to create the applications for manual tests

Example

Today, developer must run two command to deploy an application, one to create application's PVCs (https://github.com/openshift/oadp-operator/blob/master/tests/e2e/sample-applications/mysql-persistent/pvc-twoVol/aws.yaml) and other for the other objects (https://github.com/openshift/oadp-operator/blob/master/tests/e2e/sample-applications/mysql-persistent/mysql-persistent-twovol-csi.yaml). And if developer want to use an different storageClassName, it need to manually edit the YAML files.

With OpenShift Template, it easy to create all object at once and easy modify its parameters. Example https://github.com/migtools/oadp-non-admin/blob/master/hack/samples/apps/mysql.yaml

Failed approach

Tried in https://github.com/openshift/oadp-operator/pull/1364, but approach would make developers running it harder (they would need to change replace strings manually).

Start by reviewing the files under tests/e2e/sample-applications, especially the mysql-persistent YAML files linked in the issue, and compare them with the example template in the oadp-non-admin repository. Create OpenShift Templates that deploy each sample application and expose storageClassName and related values as parameters, so one template creates all required objects without manual string replacement.