Mail handler edit UI breaks when the project is archived

Issue Summary

When a project key is archived, the mail handler edit UI breaks after we click the first Next button - the edit screen vanishes.

We can see in a HAR file that Jira sends to the UI the configured project key and a list of the available project keys - the archived project doesn't show up, breaking the UI.

It would probably make sense to just delete the mail handler when archiving a project or display a warning for the archived project in the Incoming Mail screen.

Steps to Reproduce

1. Create a project
2. Create a mail handler and associate with the project
3. Archive the project
4. Attempt to edit the mail handler

Expected Results

It works normally.

Actual Results

The UI disappears after clicking the Next button.

No errors are visible, as the error happens in the UI.

Workaround

Delete the mail handler, as it doesn't make sense to exist anymore.