Fix kourier tls runtime tests

[skonto]

Fixes #15697

Proposed Changes

• See comment here for why this fix is needed.
• Brings back the disabled tests
• Makes activator handler aware of whether we are hitting a cluster IP or a Pod IP.

[knative-prow]

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[codecov]

Codecov Report

Attention: Patch coverage is 58.82353% with 7 lines in your changes missing coverage. Please review.

Project coverage is 80.81%. Comparing base (da5e7fd) to head (8b9aab9).
Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/activator/handler/handler.go	22.22%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15732      +/-   ##
==========================================
- Coverage   80.88%   80.81%   -0.07%     
==========================================
  Files         222      222              
  Lines       18063    18075      +12     
==========================================
- Hits        14610    14608       -2     
- Misses       3083     3096      +13     
- Partials      370      371       +1     

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[skonto]

@dprotaso gentle ping

[skonto]

@dprotaso gentle ping