Ignore eventing error, when eventing is not installed

[creydr]

Fixes #3404

Changes

• 🧹 Ignore error about missing Knative Eventing installation on func deploy when Eventing is not required (when the user defined subscriptions for a Function and Eventing would not be installed, then an error of course is still raised)

[knative-prow]

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 54.59%. Comparing base (f75c581) to head (0c73f40).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/k8s/deployer.go	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3428      +/-   ##
==========================================
- Coverage   54.62%   54.59%   -0.03%     
==========================================
  Files         179      179              
  Lines       20228    20231       +3     
==========================================
- Hits        11049    11045       -4     
- Misses       8009     8014       +5     
- Partials     1170     1172       +2     

Flag	Coverage Δ
e2e	38.56% <0.00%> (-0.01%)	⬇️
e2e go	32.75% <0.00%> (-0.01%)	⬇️
e2e node	28.65% <0.00%> (-0.01%)	⬇️
e2e python	32.26% <0.00%> (+0.01%)	⬆️
e2e quarkus	28.80% <0.00%> (-0.01%)	⬇️
e2e rust	28.21% <0.00%> (-0.01%)	⬇️
e2e springboot	26.66% <0.00%> (-0.01%)	⬇️
e2e typescript	28.76% <0.00%> (-0.01%)	⬇️
integration	17.55% <0.00%> (-0.05%)	⬇️
unit macos-14	42.27% <0.00%> (-0.01%)	⬇️
unit macos-latest	42.27% <0.00%> (-0.01%)	⬇️
unit ubuntu-24.04-arm	42.60% <0.00%> (-0.01%)	⬇️
unit ubuntu-latest	43.16% <0.00%> (-0.01%)	⬇️
unit windows-latest	42.29% <0.00%> (-0.01%)	⬇️

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