[release-1.15] Added the serving manifest at 1.15.3

[houshengbo]

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[knative-prow]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.69%. Comparing base (41b44a7) to head (9aad810).
Report is 1 commits behind head on release-1.15.

Additional details and impacted files

@@              Coverage Diff              @@
##           release-1.15    #1968   +/-   ##
=============================================
  Coverage         63.69%   63.69%           
=============================================
  Files                53       53           
  Lines              2592     2592           
=============================================
  Hits               1651     1651           
  Misses              826      826           
  Partials            115      115           

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