Scope* Update ~8-10 core test cases

** Basic Windows workload tests
** BYOH tests
** PVC/storage tests
** HPA/scaling tests

• Replace static YAML file references with template renderers
• Replace template usage with code generators
• Run updated tests and fix any issues
• Keep old YAML files (don't delete yet)

Acceptance Criteria

• ~8-10 core test cases updated to use new approach
• Tests import github.com/openshift/openshift-tests-private/test/extended/util/winc
• Tests use RenderWindowsWebServerTemplate() instead of static files
• Tests use code generators (GenerateNamespace, GeneratePVC, etc.)
• All updated tests pass in CI
• Old YAML files still present (not deleted yet)

Dependencies

Blocked by: WINC-1572 (need config structs and renderers)

Story Points: 3