`che-operator` PR should contains basic scenarios to test

[tolusha]

Is your task related to a problem? Please describe

For significant updates such as [1], we must ensure that nothing breaks on the operator side.
To achieve this, we should introduce a set of basic test scenarios, for example:

• starting and stopping a workspace
• replicating data
• checking operator logs for error messages
  etc

[1] eclipse-che/che-operator#2042

Describe the solution you'd like

Add scenarios to test in a PR template.

Describe alternatives you've considered

No response

Additional context

No response