Fix graph display when values in series have different suffixes

[floreks]

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[codecov]

Codecov Report

Merging #4637 into master will increase coverage by 0.2%.
The diff coverage is 61.29%.

@@            Coverage Diff            @@
##           master    #4637     +/-   ##
=========================================
+ Coverage   45.22%   45.42%   +0.2%     
=========================================
  Files         214      214             
  Lines        9987     9978      -9     
  Branches      106       96     -10     
=========================================
+ Hits         4517     4533     +16     
+ Misses       5205     5180     -25     
  Partials      265      265

Impacted Files	Coverage Δ
src/app/frontend/common/components/graph/helper.ts	60.97% <60%> (+29.49%)	⬆️
.../app/frontend/common/components/graph/component.ts	76.78% <63.63%> (+9.47%)	⬆️

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