Remove Docker Pulls" bar chart at the bottom

[xavierfacq]

This PR is related to the issues #349

Remove the Docker pulls from the bottom (duplicated with the pie chart)

I have also:

• remove expect(container).toMatchSnapshot(); because HightChart generates differents values at runtime
• Add a new Test file on the Download component

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[codecov]

Codecov Report

Merging #363 (05c4fd9) into main (c6984d4) will increase coverage by 38.57%.
Report is 1 commits behind head on main.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             main     #363       +/-   ##
===========================================
+ Coverage   13.66%   52.24%   +38.57%     
===========================================
  Files           9        9               
  Lines         849      848        -1     
  Branches       17       34       +17     
===========================================
+ Hits          116      443      +327     
+ Misses        733      405      -328     

Files	Coverage Δ
src/Graph/Download.tsx	100.00% <ø> (+100.00%)	⬆️

... and 3 files with indirect coverage changes

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