[release-1.16] fix ever-accumulating memory in logger

[k8s-infra-cherrypick-robot]

This is an automated cherry-pick of #5284

/assign nojnhuh

Fixed an issue where CAPZ was accumulating memory over time that could never be garbage collected.

[mboersma]

/lgtm
/approve

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 45864ae5e2191efdac1b72e9f4d7964d4455eb18

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mboersma

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[nojnhuh]

/kind bug

[codecov]

Codecov Report

Attention: Patch coverage is 77.77778% with 2 lines in your changes missing coverage. Please review.

Project coverage is 52.35%. Comparing base (30592f6) to head (bf6d8f2).
Report is 5 commits behind head on release-1.16.

Files with missing lines	Patch %	Lines
util/tele/span_logger.go	77.77%	2 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.16    #5285      +/-   ##
================================================
- Coverage         52.82%   52.35%   -0.48%     
================================================
  Files               273      273              
  Lines             29143    29147       +4     
================================================
- Hits              15394    15259     -135     
- Misses            12947    13087     +140     
+ Partials            802      801       -1     

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[nojnhuh]

/retest

[nojnhuh]

/retest

[jackfrancis]

/retest

[nojnhuh]

/retest