1. Proposed title of this feature request

Not allow to start a cluster upgrade if master MCP is paused

2. What is the nature and description of the request?

Upgrading a cluster with paused master MCP will never finish until the MCP is un-paused.

Additional info:
The upgrade should warn if ANY MCP is paused, to avoid let worker nodes outdated by mistake, and not start if master MCP is paused.
An option like `--skip-paused-mcp` or similar could be added to skip (only) NON-master MCP to the check.

3. Why does the customer need this? (List the business requirements here)

To prevent non finished cluster upgrades.

4. List any affected packages or components.

MCP, Over the Air upgrades