Show the sum of the power usage in power track's tooltips

[julienw]

deploy preview

I won't be able to change it more before my holidays but I believe it's fairly ready now. Please change the labels if needed and then merge when approved :-)

Please look at the individual commits. The first commits are "technical" in that they're extracting the tooltip rendering into its own component and file, so that we won't rerender the graph for each new preview selection.

[codecov[bot]]

Codecov Report

Merging #4172 (8ca762f) into main (78cc919) will increase coverage by 0.01%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #4172      +/-   ##
==========================================
+ Coverage   88.43%   88.44%   +0.01%     
==========================================
  Files         280      281       +1     
  Lines       24564    24587      +23     
  Branches     6557     6559       +2     
==========================================
+ Hits        21722    21747      +25     
+ Misses       2640     2638       -2     
  Partials      202      202              

Impacted Files	Coverage Δ
src/components/timeline/TrackPowerGraph.js	93.47% <100.00%> (+0.71%)	:arrow_up:
src/components/tooltip/TrackPower.js	100.00% <100.00%> (ø)

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[julienw]

Hey @canova, this is now ready for review! (again :-) )