Fix: added handling for crosszone routing header for http

[pulkit4tech]

• Description and context for reviewers:
  Currently crosszone doesn't work over http - https://docs.google.com/document/d/1g8bHzl1zyrOnKd6yLKs9lGctMnVEVjYenDJ7WWJJQb8/edit?usp=sharing
  In this PR, adding handling for Routing header with crosszone as first candidates

RELEASE NOTES:

• added handling for crosszone routing header for http
• rewrote test to be more generic

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.06%. Comparing base (07420c2) to head (ac4c614).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2413   +/-   ##
=======================================
  Coverage   85.06%   85.06%           
=======================================
  Files         278      278           
  Lines       16429    16433    +4     
=======================================
+ Hits        13975    13979    +4     
  Misses       2002     2002           
  Partials      452      452           

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