Description of problem:
User has selected some of the security groups under the "Additional security groups" section in Networking (enabled with Install into an existing VPC option) > VPC settings step of ROSA wizard. User has selected different VPC from the drop-down and as result of the same, the security group definition has been changed but the indication about the previously selected security groups are still stayed wrongly.

Please see the attached recordings SGIndicationVPCSwitchIssue.mp4

How reproducible:

always

Steps to Reproduce:

1. Open OCM UI staging.
2. Open ROSA wizard and choose control plane as "Classic".
3. Go to Networking step and enable the " Install into an existing VPC option"
4. Click "Next" button.
5. Select a VPC (make sure it has some security group associated) and fill the subnet definitions.
6. Expand the "Additional security groups" section.
7. Select few security groups.
8. Click on VPC drop-down and select another VPC ( should have some security groups)
9. See the behavior in "Additional security groups" section.

Actual results:

At step 9, The "Select security groups" drop-down indicated wrongly the selected security group count as per previous selection. This is wrong behavior. 

Expected results:

At step 9, The "Select security groups" drop-down should be reset based on the new VPC selection to avoid confusions