Restore: Multi-image Lesion window

[brianhelba]

Restore #105

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[brianhelba]

@volishevko I think I've found a bug in #105 that was only showing up in Production. The bug causes the images within the gallery to not load:

However, no console errors are shown.

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After some debugging, I noticed that when connected to the Sandbox API, the request to /api/v2/lesions/ is relatively fast, and it tends to respond before some of the later API calls. However, on the Production API, it looks like /api/v2/lesions/ is significantly slower (taking ~3s).

When I used an extension like URL Throttler to artificially slow down just the /api/v2/lesions/ endpoint when connected to the Sandbox API, I was able to reproduce the original bug.

We're working to make /api/v2/lesions/ faster on Production, but we can't guarantee that API requests will respond in any particular order or amount of time. So, the race condition here should be fixed.