Replace lerna --scope with npm --prefix for a cleaner output

[Hypnosphi]

Before:

After:

[codecov]

Codecov Report

Merging #1788 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1788   +/-   ##
=======================================
  Coverage   21.14%   21.14%           
=======================================
  Files         252      252           
  Lines        5693     5693           
  Branches      697      679   -18     
=======================================
  Hits         1204     1204           
- Misses       3938     3971   +33     
+ Partials      551      518   -33

Impacted Files	Coverage Δ
app/vue/src/server/utils.js	0% <0%> (-32.15%)	⬇️
...codemod/src/transforms/update-organisation-name.js	40.62% <0%> (ø)	⬆️
addons/storyshots/src/require_context.js	0% <0%> (ø)	⬆️
...s/left_panel/stories_tree/tree_decorators_utils.js	45.23% <0%> (ø)	⬆️
addons/events/src/components/Event.js	0% <0%> (ø)	⬆️
addons/info/src/components/Node.js	38.88% <0%> (ø)	⬆️
addons/knobs/src/KnobStore.js	6.81% <0%> (ø)	⬆️
lib/ui/src/modules/ui/libs/filters.js	47.36% <0%> (ø)	⬆️
lib/ui/src/modules/api/actions/api.js	50.47% <0%> (ø)	⬆️
...es__/update-addon-info/update-addon-info.output.js	0% <0%> (ø)	⬆️
... and 17 more

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