Fix #2442 by adding webmanifest extension to content-type map #19661
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Fixes #2442
We're very conservative about what we add to this list, restricting it only to high-value items that are backed by a clear RFC, well-adopted spec or IANA registration. WebManifest had a spec but now is getting enough hits (as PWAs become more common) and Blazor seems to be interfering with adding this manually (though I'm not sure I understand that and I think it needs further investigation).