Create new ActiveGate and Proxy custom TLS certificates (#4391)

[aorcholski]

JIRA

PR main

Description

cherry-pick from main

How can this be tested?

make test/e2e/istio

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 64.29%. Comparing base (f1dfd55) to head (e7d4daa).
Report is 1 commits behind head on release-1.4.

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Additional details and impacted files

@@             Coverage Diff              @@
##           release-1.4    #4393   +/-   ##
============================================
  Coverage        64.29%   64.29%           
============================================
  Files              402      402           
  Lines            27135    27135           
============================================
  Hits             17447    17447           
  Misses            8317     8317           
  Partials          1371     1371           

Flag	Coverage Δ
unittests	64.29% <ø> (ø)

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