Use a better sanitize function

[jeefy]

/assign @maciaszczykm @floreks

/cc @liggitt

[floreks]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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[codecov]

Codecov Report

Merging #4232 into master will decrease coverage by 0.01%.
The diff coverage is 50%.

@@            Coverage Diff             @@
##           master    #4232      +/-   ##
==========================================
- Coverage      46%   45.99%   -0.02%     
==========================================
  Files         198      198              
  Lines        9271     9271              
  Branches      105      105              
==========================================
- Hits         4265     4264       -1     
- Misses       4746     4747       +1     
  Partials      260      260

Impacted Files	Coverage Δ
src/app/frontend/common/pipes/safehtml.ts	71.42% <50%> (ø)	⬆️
...p/backend/integration/metric/common/aggregation.go	89.09% <0%> (-1.82%)	⬇️

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[awly]

What versions of the dashboard does this affect?

[jeefy]

@awly From testing, 2.0.0-beta1 through 2.0.0-beta3.

Versions before weren't affected and 2.0.0-beta4 was cut shortly after this PR was merged.