Workaround for IP resolution from x-Forwarded-For with multiple proxies

[acelaya]

Closes #2351

Fix visitor IP address resolution when Shlink is served behind more than one reverse proxy.

This regression was introduced due to a change in behavior in akrabat/rka-ip-address-middleware, that now picks the first address from the right after excluding all trusted proxies.

Since Shlink does not set trusted proxies, this means the first IP from the right is now picked instead of the first from the left, so we now reverse the list before trying to resolve the IP, to get back previous behavior.

In the future, Shlink will allow you to define trusted proxies, to avoid other potential side effects because of this reversing of the list.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.78%. Comparing base (65c0103) to head (c650a3e).
Report is 3 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff             @@
##             develop    #2359   +/-   ##
==========================================
  Coverage      93.77%   93.78%           
- Complexity      1702     1705    +3     
==========================================
  Files            276      277    +1     
  Lines           5895     5904    +9     
==========================================
+ Hits            5528     5537    +9     
  Misses           367      367           

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