Cone of confidence legend item

[dlabrecq]

Updated the charts to show the forecast cone of confidence as its own legend item. I also used that new left-pointed triangle I created for PatternFly charts

https://issues.redhat.com/browse/COST-1492

Cumulative view

Daily view

[ddonahue007]

LGTM

[codecov-commenter]

Codecov Report

Merging #1985 (2c4cf01) into master (6fbeadb) will increase coverage by 0.06%.
The diff coverage is 57.14%.

@@            Coverage Diff             @@
##           master    #1985      +/-   ##
==========================================
+ Coverage   70.97%   71.03%   +0.06%     
==========================================
  Files         378      378              
  Lines        6938     6937       -1     
  Branches     1491     1492       +1     
==========================================
+ Hits         4924     4928       +4     
+ Misses       1987     1983       -4     
+ Partials       27       26       -1     

Impacted Files	Coverage Δ
...ponents/charts/dailyTrendChart/dailyTrendChart.tsx	8.21% <0.00%> (-0.12%)	⬇️
...tore/dashboard/ocpDashboard/ocpDashboardWidgets.ts	100.00% <ø> (ø)
src/components/charts/trendChart/trendChart.tsx	81.51% <77.77%> (-0.07%)	⬇️
src/components/charts/common/chartUtils.ts	65.93% <100.00%> (+5.32%)	⬆️

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