Description of problem:

The argocd-operator's logic for setting the number of status/operation processors for
Application Controller does not let you reduce the number below 10.

As Jann noted on Slack, this is likely a bug and I agree.

Acceptance criteria: 

• argocd-operator should allow a user to set any (reasonable) value for application-controller's processors, and these should be reflected in the application-controller settings.
   * Tests to verify the above works as expected.