Centralize DevWorkspace Happy Path test

[sleshchenko]

Is your task related to a problem? Please describe

The problem is that currently there are 3 targets for DevWorkspace Happy path test run by Prow:

• Che Operator;
• Dashboard;
• DevWorkspace Operator;

And they duplicate some resources, which means - when you need to fix some even minor stuff, like devfile/project which should be used for testing, you need to propagate it to all consumers.

Describe the solution you'd like

Setting up the infrastrucure (deploying Che, DWO) is on consumer side, but tests logic - how to run it, which image to use, which devfile to use should be centralized somehow.

Describe alternatives you've considered

No response

Additional context

No response