Motivation: Sometimes the files are not available anymore on the Service
Worker side. The Trace Viewer frontend then falls back to `file?path=`
and uses its response, no matter what the response status is.
This patch checks for the response status code before using its
response.
e.g. https://github.com/microsoft/playwright-dotnet/issues/2775 after
some time / and some other reports.
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Signed-off-by: Max Schmitt <max@schmitt.mx>
Co-authored-by: Dmitry Gozman <dgozman@gmail.com>
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