Werk #11607: Improve GUI security: Prevent changing content type

All web pages served by Checkmk will now have the HTTP header Header always set X-Content-Type-Options: "nosniff" set. It prevents a client from guessing the content type based on the provided file. This is a way to opt out of MIME type sniffing, or, in other words, to say that the MIME types are deliberately configured.

Further information can be found here:

https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Content-Type-Options https://www.chromium.org/Home/chromium-security/corb-for-developers

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