Mrc 6873 variable width legend

[M-Kusumgar]

the general strategy is to collect up all the labels that can appear on the legend (excluded those that are hidden in the graph config) and fill in a paragraph tag one by one and find the longest width, we then set the legend text width equal to that

this should ensure that the legend width is the same across all different graphs and never longer than it needs to be because it ignores hidden variables

unfortunately, this is another one of those features thats hard to test, i cant really test the width value at all because the width depends on font family, font size, text content, which can all change, a test that checks the numerical value of the width is far too brittle

[codecov]

Codecov Report

❌ Patch coverage is 62.50000% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 99.31%. Comparing base (cdf98e3) to head (986dee9).

Files with missing lines	Patch %	Lines
app/static/src/components/WodinLegend.vue	62.50%	6 Missing and 3 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           mrc-6446     #257      +/-   ##
============================================
- Coverage     99.51%   99.31%   -0.20%     
============================================
  Files           190      190              
  Lines          4524     4548      +24     
  Branches       1006     1015       +9     
============================================
+ Hits           4502     4517      +15     
- Misses           19       25       +6     
- Partials          3        6       +3     

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[M-Kusumgar]

this test failed because we hardcoded tick values but these change because of the width of the plot, so i am just testing that the tick values have changed and they are the same across all the different graphs, i think its a less brittle test