Fix addon Knobs: add array in Object PropTypes

[jebarjonet]

Knobs addon

value prop in object type of knob now accepts PropTypes.array, while only PropTypes.object was accepted.

We now avoid warnings when we use arrays of objects in object knobs, which actually works perfectly fine.

Example working fine but throwing warnings in browser console concerning Proptypes.

const values = object('options', [
  {
    value: 'red',
    title: 'Red',
    condition: '1',
  },
  {
    value: 'blue',
    title: 'Blue',
    condition: '1',
  },
  {
    value: 'yellow',
    title: 'Yellow',
    condition: '1',
  },
  {
    value: 'green',
    title: 'Green',
    condition: '1',
  },
])

[codecov]

Codecov Report

Merging #2227 into master will not change coverage.
The diff coverage is 0%.

@@           Coverage Diff           @@
##           master    #2227   +/-   ##
=======================================
  Coverage   22.16%   22.16%           
=======================================
  Files         268      268           
  Lines        5875     5875           
  Branches      710      701    -9     
=======================================
  Hits         1302     1302           
- Misses       4027     4045   +18     
+ Partials      546      528   -18

Impacted Files	Coverage Δ
addons/knobs/src/components/types/Object.js	5.81% <0%> (ø)	⬆️
lib/ui/src/modules/ui/configs/handle_routing.js	28.04% <0%> (ø)	⬆️
lib/ui/src/modules/api/actions/api.js	50.47% <0%> (ø)	⬆️
addons/knobs/src/react/WrapStory.js	19.54% <0%> (ø)	⬆️
...s/left_panel/stories_tree/tree_decorators_utils.js	45.23% <0%> (ø)	⬆️
...codemod/src/transforms/update-organisation-name.js	40.62% <0%> (ø)	⬆️
lib/ui/src/modules/ui/configs/init_panels.js	25% <0%> (ø)	⬆️
lib/ui/src/modules/ui/containers/down_panel.js	23.52% <0%> (ø)	⬆️
...rc/modules/ui/components/left_panel/text_filter.js	30.98% <0%> (ø)	⬆️
addons/knobs/src/components/types/Color.js	8.1% <0%> (ø)	⬆️
... and 11 more

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[Hypnosphi]

This is already fixed in release/3.3 with #1701, but maybe we should do the same on master
@ndelangen what do you think?

[ndelangen]

great!

[Hypnosphi]

Should we backport the changes in docs as well?
https://github.com/storybooks/storybook/pull/1701/files

[ndelangen]

Yes that sounds like the logical thing to do!

[ndelangen]

@jebarjonet Do you want to add the documentation changes?

[Hypnosphi]

@jebarjonet do you want to do that? It should be just a matter of copypasting

[jebarjonet]

@ndelangen @Hypnosphi I updated the doc :) (I did not update stories as they are not the same as in release/3.3)

[ndelangen]

@jebarjonet Thank you for this, really appreciate you helping us out, every small improvement helps! 🙇

If you want to help more and are looking for something, feel free to message me 👍