Wrong Windows MD workers replicas on prod plan

[knabben]

Bug description
Windows clusters using prod creates 3 MD for vSphere (one for each failure zone) and always set WORKER_MACHINE_COUNT in the first MD replicas instead of spreading them out.

Affected product area (please put an X in all that apply)

• ( ) APIs
• ( ) Addons
• ( ) CLI
• ( ) Docs
• ( ) IAM
• ( ) Installation
• (x) Plugin
• ( ) Security
• ( ) Test and Release
• ( ) User Experience
• ( ) Developer Experience

Expected behavior
To have the workers spread across MDs as Linux, the Cluster template is already fixed on
#3893

Steps to reproduce the bug

Version (include the SHA if the version is not obvious)

Environment where the bug was observed (cloud, OS, etc)

Relevant Debug Output (Logs, manifests, etc)