feat(frontend): tag feedback form in matomo

[lionelB]

track event in matomo (#294)

[revolunet]

👍👍👍 trop bien. faudra voir comment généraliser ça :) useMatomo ? :p

[codecov]

Codecov Report

Merging #360 into master will increase coverage by 0.02%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master     #360      +/-   ##
==========================================
+ Coverage   42.33%   42.35%   +0.02%     
==========================================
  Files          57       57              
  Lines         711      713       +2     
  Branches      104      104              
==========================================
+ Hits          301      302       +1     
- Misses        369      370       +1     
  Partials       41       41

Impacted Files	Coverage Δ
...ages/code-du-travail-frontend/src/common/Answer.js	50% <33.33%> (ø)	⬆️

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[lionelB]

@douglasduteil je comprend pas le retour de codecov qui met un fail la PR :(

[douglasduteil]

@douglasduteil je comprend pas le retour de codecov qui met un fail la PR :(

Codecov veut plus de coverage sur le patch lui même.
Il indique : 33.33% of diff hit (target 42.33%)