* Plugins: Remove support for V1 manifests
* Plugins: Make proxy endpoints not leak sensitive HTTP headers
* Security: Fix do not forward login cookie in outgoing requests
(cherry picked from commit 4539c33fce)
Co-authored-by: Will Browne <wbrowne@users.noreply.github.com>
Moves common request proxy utilities to proxyutil package with
support for removing X-Forwarded-Host, X-Forwarded-Port,
X-Forwarded-Proto headers, setting X-Forwarded-For header
and cleaning Cookie header.
Using the proxyutil package to prepare and clean request
headers before resource calls.
Closes#21512
