fix(plugin-chart-echarts): sanitize series from html tags

[villebro]

🐛 Bug Fix

Remove html tags from series names in tooltip.

BEFORE

Currently a series names that could be html tags don't show correctly on the tooltip(the series name <NULL> which can be seen on the legend does not show):

AFTER

After they show correctly (legend omitted in screenshot):

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[codecov]

Codecov Report

Merging #1126 (5033fc8) into master (f059a81) will increase coverage by 0.02%.
The diff coverage is 44.44%.

@@            Coverage Diff             @@
##           master    #1126      +/-   ##
==========================================
+ Coverage   29.00%   29.03%   +0.02%     
==========================================
  Files         463      463              
  Lines        9339     9342       +3     
  Branches     1494     1494              
==========================================
+ Hits         2709     2712       +3     
  Misses       6418     6418              
  Partials      212      212              

Impacted Files	Coverage Δ
...plugin-chart-echarts/src/BoxPlot/transformProps.ts	56.25% <0.00%> (ø)
...s/plugin-chart-echarts/src/Graph/transformProps.ts	71.23% <0.00%> (ø)
.../plugin-chart-echarts/src/Funnel/transformProps.ts	75.00% <50.00%> (+0.64%)	⬆️
...ins/plugin-chart-echarts/src/Pie/transformProps.ts	71.11% <50.00%> (+0.65%)	⬆️
plugins/plugin-chart-echarts/src/utils/prophet.ts	91.83% <100.00%> (ø)
plugins/plugin-chart-echarts/src/utils/series.ts	92.64% <100.00%> (+0.10%)	⬆️

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[stephenLYZ]

@villebro great job! A small suggestion, maybe we can sanitize some general string like echarts.format.encodeHTML:

[villebro]

@villebro great job! A small suggestion, maybe we can sanitize some general string like echarts.format.encodeHTML:

Yes, much cleaner approach. I'll update accordingly 👍

[villebro]

@stephenLYZ I left the original sanitizeHtml function in place so we can more easily swap encodeHTML out if needed later.

[kgabryje]

LGTM