Add RHPAM version validation for RHPAM operator

1. I provisioned an OpenShift cluster and added the Business Automation operator to a project. 2. I attempted to create a kieapp; however, that failed because the 7.4 images are not yet available by default in the OCP internal registry (they can be imported from registry.redhat.io). Reviewing the image streams that are available in the internal registry, I noted that the 7.3 images were available. 3. I reviewed the generated CR for the kieapp that I created, and I noted the spec.commonConfig.version field which is defaulted to 7.4. 4. I created a new kieapp, explicitly specifying version to 7.3, e.g. : apiVersion: app.kiegroup.org/v1 kind: KieApp metadata: name: rhpam-trial73 namespace: pam-test1 spec: environment: rhpam-trial commonConfig: version: '73' 5. The operator attempts to run the 7.3 version and fails to start the kieserver pod with an error that looks like the following : " PostStartHookError: command '/bin/sh /opt/eap/bin/launch/jboss-kie-kieserver-hooks.sh' exited with 127: /bin/sh: /opt/eap/bin/launch/jboss-kie-kieserver-hooks.sh: No such file or directory "