POC: use libkpa autoscaler instead of the built-in implementation

[Fedosin]

Fixes #

Proposed Changes

Release Note

[knative-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Fedosin
Once this PR has been reviewed and has the lgtm label, please assign dsimansk for approval. For more information see the Code Review Process.

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[codecov]

Codecov Report

Attention: Patch coverage is 74.48980% with 25 lines in your changes missing coverage. Please review.

Project coverage is 80.93%. Comparing base (cada0f4) to head (e7c01f5).

Files with missing lines	Patch %	Lines
pkg/autoscaler/scaling/libkpa_autoscaler.go	73.95%	17 Missing and 8 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15923      +/-   ##
==========================================
- Coverage   80.98%   80.93%   -0.06%     
==========================================
  Files         210      211       +1     
  Lines       16780    16876      +96     
==========================================
+ Hits        13590    13658      +68     
- Misses       2838     2856      +18     
- Partials      352      362      +10     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.