fix(proxy) keep proxy-authentication request header and proxy-authenticate response header #7724
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Summary
It was reported by @ly123-liu on #7722 that Kong removes
Proxy-Authentication
header from upstreamrequest.
RFC2612 (https://datatracker.ietf.org/doc/html/rfc2616#section-13.5.1) specifies them as a hop-by-hop
headers that should be removed. But it did not consider use case of having multiple proxies, so RFC7235
corrected the wording https://datatracker.ietf.org/doc/html/rfc7235#section-4.4.
Issues Resolved
Fix #7722