fix: Add proxy registry key by dest server + name (cherry-pick #21791)

[gcp-cherry-pick-bot]

Cherry-picked fix: Add proxy registry key by dest server + name (#21791)

Signed-off-by: Leonardo Luz Almeida [email protected]

[leoluz]

LGTM

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 55.02%. Comparing base (102853d) to head (888da8f).
Report is 2 commits behind head on release-2.13.

Files with missing lines	Patch %	Lines
server/extension/extension.go	50.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           release-2.13   #21793      +/-   ##
================================================
- Coverage         55.03%   55.02%   -0.01%     
================================================
  Files               320      320              
  Lines             54837    54843       +6     
================================================
- Hits              30180    30179       -1     
+ Misses            22066    22063       -3     
- Partials           2591     2601      +10     

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