[release-1.16] Fix configuration metadata inconsistency

[knative-prow-robot]

This is an automated cherry-pick of #15601

Fixes a problem in configuration reconciliation where labeler creates a different order of the route names listed via the annotation `serving.knative.dev/routes` compared to the configuration reconciler.

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 3 lines in your changes missing coverage. Please review.

Project coverage is 83.55%. Comparing base (6a27004) to head (0660643).
Report is 1 commits behind head on release-1.16.

Files with missing lines	Patch %	Lines
pkg/reconciler/labeler/accessors.go	50.00%	3 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.16   #15650      +/-   ##
================================================
- Coverage         83.57%   83.55%   -0.03%     
================================================
  Files               219      219              
  Lines             17421    17427       +6     
================================================
+ Hits              14560    14561       +1     
- Misses             2491     2496       +5     
  Partials            370      370              

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[skonto]

/lgtm
/approve

[knative-prow]

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