Closes #21 testing add code coverage for e2e tests

[quentinderoubaix]

Allow to compute e2e code coverage and push on codecov.
Also boosts e2e by using sharding.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (main@4d77a19). Click here to learn what that means.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #22   +/-   ##
=======================================
  Coverage        ?   87.04%           
=======================================
  Files           ?       60           
  Lines           ?     1814           
  Branches        ?      362           
=======================================
  Hits            ?     1579           
  Misses          ?      184           
  Partials        ?       51           

Flag	Coverage Δ
e2e-1	39.62% <0.00%> (?)
e2e-10	77.11% <0.00%> (?)
e2e-2	81.85% <0.00%> (?)
e2e-3	81.85% <0.00%> (?)
e2e-4	63.22% <0.00%> (?)
e2e-5	80.41% <0.00%> (?)
e2e-6	80.41% <0.00%> (?)
e2e-7	67.90% <0.00%> (?)
e2e-8	80.08% <0.00%> (?)
e2e-9	80.08% <0.00%> (?)
unit	93.08% <0.00%> (?)

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