UI appears distorted when the project does not exist

[nitishfy]

Checklist

• [x] I've searched the issue queue to verify this is not a duplicate bug report.
• [x] I've included steps to reproduce the bug.
• [x] I've pasted the output of kargo version.
• [x] I've pasted logs, if applicable.

Description

If you delete the project and refresh the UI for the deleted project path, the UI will appear distorted.

Screenshots

Steps to Reproduce

Go to the /project/unknown-project endpoint of the kargo and you'll see the UI a bit distorted.

Version

Client Version: v0.8.7
Server Version: v0.8.7

[krancour]

When that Project view initially loads, I think there's an opportunity to perform a get project request and gracefully handle a 404.

That being said, the UI also periodically refreshes all elements, so if you delete a Project (using the CLI or something) and don't refresh the Project view, I think you're still going to end up seeing all these individual errors that result not from looking for a Project that doesn't exist, but result from looking for things like Warehouses, Stages, and Freight belonging to a Project that no longer exists.

I'm not sure of the best way to deal with this.

cc @rbreeze @Marvin9 @rpelczar you guys probably have much better insight into how to improve the UX here.