add security middleware to block malicious paths#3102
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There were a bunch of sentry errors from someone trying to break in into our system via relativ paths, or invalid UTF-8.
Instead of trying to handle these errors in the whole codebase, we just fully block these URLs.
I also thought about using the CDN to block these, but then decided to have it here for consistency.
If the middleware gets too big, we could think about this:
https://www.fastly.com/documentation/guides/next-gen-waf/using-ngwaf/signals/using-system-signals/
related but not needed:
#3101