[whatwg/fetch] More CORB-protected MIME types (#721)

@anforowicz @csreis did you do an exhaustive evaluation of MIME types? E.g., any reason `text/webvtt` isn't there? We also blocked `text/csv` for scripts (standardized and in Firefox at least, not sure if Chrome has fixed that yet), can we block that MIME type for CORB?

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