Add refresh_only input parameter to create-run action #2993

Current Behavior

The create-run action in hashicorp/tfc-workflows-github currently supports a refresh parameter (via the API payload), but does not expose a refresh_only input parameter.

When creating a plan run, the action sets:

• "refresh": true - Refreshes state before planning
• "refresh-only": false - Still creates a plan with proposed changes

{"CanApply":true,"CanCancel":true,"CanDiscard":true,"CanForceCancel":false,"CanForceExecute":true},"plan-only":true,"position-in-queue":0,"refresh":true,"refresh-only":false,"source":"tfe-api","status":"planned_and_finished","status-timestamps".....

Desired Behavior

Add a refresh_only input parameter to the create-run action that maps to the API's refresh-only attribute.

This would allow users to create refresh-only runs that:

1. Update Terraform state to match real-world infrastructure
2. Do NOT propose any infrastructure changes
3. Are useful for drift detection workflows