IsInstanceEnabled should consider both HELIX_ENABLED and InstanceOperation

[xyuanlu]

Describe the bug

When HELIX_ENABLED is true, but InstanceOperation is DISABLED, IsInstanceEnabled returns false. Where it should return true

To Reproduce

This is constantly reproduceble

Expected behavior

Helix deprecated the HELIX_ENABLED and added a new InstanceOperation field.
If an instance is disabled using InstanceOperation but enabled using setting HELIX_ENABLED to true (by helix lib with old version), IsInstanceEnabled will return false.
When HELIX_ENABLED is true, but InstanceOperation is DISABLED, IsInstanceEnabled returns false. Where it should return true.

Additional context

Add any other context about the problem here.