chore: clean up old, unused telemetry code

[programmer04]

What this PR does / why we need it:

Since merging PR #3552 in January the old, unused code related telemetry has been left in repository with annotation in PR's description

The existing code for anonymous reports was left as is in this PR but we can remove it if we decide that's the approach we'd like to take.

I think today it's obvious that using kubernetes-telemetry is the way of doing telemetry in KIC. Thus this PR removes old, unused code.

Special notes for your reviewer:

It's been spotted during work on #3916. As you can see e.g. dead code in internal/meshdetect/detector.go contains CoreV1 Endpoints.

[czeslavo]

Good catch 👍

[pmalek]

👍 I can see some knative related integration tests failures 🤔 Seem unrelated but worth looking into (or creating an issue to investigate later on.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +9.0 🎉

Comparison is base (f70cdcd) 49.2% compared to head (90b22ae) 58.2%.

❗ Current head 90b22ae differs from pull request most recent head babfa67. Consider uploading reports for the commit babfa67 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #3964     +/-   ##
=======================================
+ Coverage   49.2%   58.2%   +9.0%     
=======================================
  Files        139     139             
  Lines      16363   16115    -248     
=======================================
+ Hits        8051    9393   +1342     
+ Misses      7852    6091   -1761     
- Partials     460     631    +171     

see 49 files with indirect coverage changes

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[randmonkey]

+1 I can see some knative related integration tests failures thinking Seem unrelated but worth looking into (or creating an issue to investigate later on.

issue: #3965