Should not be able to query SIT parameters on an Inactive ManagedRegion

[AndrewTwydell]

Describe the bug

When connected to a plex with active and inactive managed regions, they show up with different icons. Inactive regions still have the ability to right click, Show SIT parameters. We should add a when clause to that menu item to only show when regions are active, and add a check to the CMCI call to prevent the error.

Additional context

[github-actions]

Thank you for creating a bug report.
We will investigate the bug and evaluate its impact on the product.
If you haven't already, please ensure you have provided steps to reproduce the bug and as much context as possible.

[davenice]

I had a little look at this, @enamkhan - didn't quite get as far as deciding how I'd want to manage adding extra bits of context string on, though so I hadn't !

https://github.com/davenice/cics-for-zowe-client/tree/davenice-only-show-sitparms-on-active-region

I think this change just hides the option on regions that are not active. I didn't prevent CMCI from making the request.