Update Getting started section in Openshift UI to use expandable section

Description

As of now, getting started section can be hidden and enable back using the button but user can close that button and it will not show back. It is confusing for the users. So add the expandable section instead of hide and show button similar to Functions List page

Acceptance Criteria

1. Update getting Started section to use expandable section in Add page
2. Update getting Started section to use expandable section in Cluster tab in overview page in Admin perspective
3. Updated the test cases

Additional Details:

Check Functions list page in Dev perspective for the design