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When UW loads, log whether `mw.fileApi.isAvailable()` is true or false via EventLogging
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Description

To determine whether we still have any reason to support non-File-API code paths, we should log the return value of mw.fileApi.isAvailable() after UploadWizard loads. I am pretty sure that all browsers supported by MediaWiki these days support it, but not entirely sure, so let's find out for certain.