fix: remove duplicate xForwardedHost handler

What does this MR do?

ghandlers.ProxyHeaders already handles the X-Forwarded-Host header.

This MR removes the proxyInitialMiddleware to avoid handling the header twice.

https://github.com/gorilla/handlers/blob/3e030244b4ba0480763356fc8ca0ade6222e2da0/proxy_headers.go#L55

TODO

• I added the Changelog trailer (e.g. Changelog: feature) to the commits that need to be included in the changelog
• I added unit tests or they are not required
• I added acceptance tests or they are not required
• I added documentation (or it's not required)
• I followed code review guidelines
• I followed Go Style guidelines