Make <persist> tag in windows-user-data secret specific to AWS

User or Developer story

As a Cluster Admin, I want the `windows-user-data` secret to entertaining the <presist> tag only for the required platform, i.e.  AWS,  so that the content of the userData is cleaner and relevant to the target platform.

Description

This ticket can be seen as a follow-up to https://issues.redhat.com/browse/WINC-888. WINC-888 defaults both tags (<powershell> and <persist>) for all platform where the <persist> tag is only required for AWS. See: https://docs.aws.amazon.com/AWSEC2/latest/WindowsGuide/ec2-windows-user-data.html#user-data-batch-scripts

For Azure the user data is persistent and will be available during the lifetime of the VM. See https://learn.microsoft.com/en-us/azure/virtual-machines/user-data#what-is-user-data. 

Engineering Details

Update the logic in https://github.com/openshift/windows-machine-config-operator/blob/master/pkg/secrets/secrets.go#L40 to only apply the `<persist>true</persist>` tag when the platform type is AWS

For QE:

only regression testing needed

Acceptance Criteria

• UserData for AWS contains the <persist>true</persist> tag
• Default userData contains only the <powershell> tag enclosing the content.