Update Carbon Ad Code

[sayzlim]

Replace legacy placement name based identifier to zone key identifier. We will discontinue the legacy identifier soon. You can check the latest ad code from sell.buysellads.com

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.54%. Comparing base (d32c85d) to head (691f792).
⚠️ Report is 5 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #740   +/-   ##
=======================================
  Coverage   93.54%   93.54%           
=======================================
  Files          19       19           
  Lines         837      837           
  Branches      199      199           
=======================================
  Hits          783      783           
  Misses         38       38           
  Partials       16       16           

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