Description of the Problem

In ROSA wizard hosted flow, when loading regions from backend , user allowed to move to next step and this results invalid/unsupported region selected by default and causes confusion. To avoid this situation, we should restrict the user from moving to next step without selecting a valid region including the situation while regions are loading from backend.

See the recording attached Screencast from 2024-10-17 12-42-06.mp4

How reproducible:

always

Steps to Reproduce:

1. Open OCM UI staging 
2. Launch ROSA wizard(hosted flow).
3. Reach to "Cluster settings > Details" step.
4. Provide cluster name and click "Next" button even before the regions are list loading.
5. See the region value and VPC loaded from "Machine pool" step.

Actual results:

The user reached to "Machine pool" step without selecting a valid region. As a result of the same the wrong region value (us-east-1) selected and loaded VPC from the same.

This create a bad flow and we should avoid the same.

Expected results:

Restrict the user from moving to next step when the valid region is not selected or while region is still loading from backend.