chore(vscode): ease flow usage

[vvo]

Summary

Following https://github.com/flowtype/flow-for-vscode#setup they recommend setting "javascript.validate.enable": false in workspace settings, otherwise I get errors like "... can only be used in a .ts file".

As I am new to flow and vscode I might be wrong, let me know vscode users contributing to Jest how it works for you today?

Test plan

None, it's an editor setting

[codecov-io]

Codecov Report

Merging #4569 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4569   +/-   ##
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  Coverage   56.16%   56.16%           
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  Files         185      185           
  Lines        6285     6285           
  Branches        3        3           
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  Hits         3530     3530           
  Misses       2754     2754           
  Partials        1        1

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[vvo]

Should we also add "flow.useNPMPackagedFlow": true so it uses the default flow-bin rather than a global one?

[cpojer]

cc @orta please advice :)

[orta]

Yep, this is recommended for the plugin 👍

And yes, "flow.useNPMPackagedFlow": true should get added too IMO

[github-actions]

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