Prevent IDE error message when closing a project
Created by: vdavid
Fixes https://github.com/sourcegraph/sourcegraph/issues/36294
Had to fix the disposing hierarchy.
@madppiper solved this in this PR: https://github.com/sourcegraph/sourcegraph/pull/36298, just it was in conflict with the current main so I re-created his solution in the current PR.
It was also a good way to properly understand what he was doing. I think I gained a better understanding of the disposing hierarchy.
Test plan
- 47 sec Loom demoing that it works
- Check the code
App preview:
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