Remove "open in browser" action in file browser view depending on mimetype

[waxlamp]

An asset that does not have a browser-compatible mimetype (e.g., NWB file) should not display the "open in new window" action icon. The action in this case will be to download the resource, which is already possible through the specific download icon.

This will require some discussion, as we would be infringing on services the browser has provided in a standard manner for a long time. Furthermore, we need to inspect the mimetype of the asset (which DANDI refers to as the "encoding format" which is stored in the asset metadata) to do this properly.

This issue stems from unresolved conversations in #1666.