replacing gen-flow-files with flow-copy-source waiting for a replacement

[chrisdugne]

Detailed purpose of the PR

replacing gen-flow-files with flow-copy-source waiting for facebook/flow#5871 (comment)

Result and observation

• Breaking changes ?
  If checked, what have you broken ?

• Extra lib ?
  If checked, Which extra lib did you add ? (name, purpose, link ...).

flow-copy-source

Testing Strategy

• Already covered by tests
• Manual testing
• Unit testing

[codecov]

Codecov Report

Merging #1445 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           master   #1445     +/-   ##
========================================
  Coverage     100%    100%             
========================================
  Files          13      97     +84     
  Lines         328    1646   +1318     
========================================
+ Hits          328    1646   +1318

Impacted Files	Coverage Δ
...oorpacademy-player-store/src/reducers/data/rank.js	100% <0%> (ø)
.../@coorpacademy-player-services/src/progressions.js	100% <0%> (ø)
...-progression-engine/src/compute-next-step/index.js	100% <0%> (ø)
...pacademy-progression-engine/src/reducers/slides.js	100% <0%> (ø)
...rpacademy-player-store/src/reducers/ui/comments.js	100% <0%> (ø)
...ges/@coorpacademy-progression-engine/src/errors.js	100% <0%> (ø)
...oorpacademy-player-store/src/utils/memoize-task.js	100% <0%> (ø)
...orpacademy-player-store/src/actions/ui/location.js	100% <0%> (ø)
...pacademy-player-store/src/actions/ui/extra-life.js	100% <0%> (ø)
...cademy-player-store/src/actions/ui/progressions.js	100% <0%> (ø)
... and 74 more

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[VincentCATILLON]

👍