Show light-colored scrollbar in dark logs mode

[eloyekunle]

This PR updates the Logs viewer to show a light-colored scrollbar in inverted (dark) mode.
Fixes #3557

[codecov]

Codecov Report

Merging #3558 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3558      +/-   ##
==========================================
+ Coverage   48.34%   48.36%   +0.01%     
==========================================
  Files         165      165              
  Lines        8027     8027              
  Branches       43       43              
==========================================
+ Hits         3881     3882       +1     
+ Misses       3865     3864       -1     
  Partials      281      281

Impacted Files	Coverage Δ
...p/backend/integration/metric/common/aggregation.go	90.9% <0%> (+1.81%)	⬆️

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[maciaszczykm]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: eloyekunle, maciaszczykm

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