[DNM][WIP] Update templates (instanced signature)

[gauron99]

• instanced go functions as default
• as instanced signature defaults to "OK" response, change this accordingly in tests (instead of echo response)
• edit tests to now use instanced function instead of the static one

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 54.80%. Comparing base (3837e3a) to head (314e76e).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/deployer/testing/integration_test_helper.go	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3378      +/-   ##
==========================================
+ Coverage   53.13%   54.80%   +1.66%     
==========================================
  Files         173      173              
  Lines       20096    20112      +16     
==========================================
+ Hits        10679    11023     +344     
+ Misses       8383     8008     -375     
- Partials     1034     1081      +47     

Flag	Coverage Δ
e2e	39.62% <ø> (-0.02%)	⬇️
e2e go	35.37% <ø> (-0.05%)	⬇️
e2e node	?
e2e python	?
e2e quarkus	?
e2e rust	?
e2e springboot	?
e2e typescript	?
integration	18.62% <0.00%> (?)
unit macos-14	44.68% <0.00%> (-0.02%)	⬇️
unit macos-latest	44.68% <0.00%> (-0.02%)	⬇️
unit ubuntu-24.04-arm	44.81% <0.00%> (-0.02%)	⬇️
unit ubuntu-latest	45.57% <0.00%> (-0.02%)	⬇️
unit windows-latest	44.70% <0.00%> (-0.02%)	⬇️

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[gauron99]

/test all