Detect new node modules added to brave-core without a LICENSE

[fmarier]

In order for node module dependencies to show up in brave://credits, a developer needs to add a README.chromium in brave/third_party/.

We could rely on the brave/third_party/npm_<module name> pattern and write an automate check which parses brave/package.json and looks for missing brave/third_party/npm_<module name> directories.

[LaurenWags]

Verified passed with

Brave | 1.12.92 Chromium: 84.0.4147.89 (Official Build) dev (64-bit)
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Revision | 19abfe7bcba9318a0b2a6bc6634a67fc834aa592-refs/branch-heads/4147@{#852}
OS | macOS Version 10.14.6 (Build 18G3020)

• Verified test plan from Add missing npm module licenses and detect missing ones brave-core#5561

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Verification passed on

Brave | 1.12.101 Chromium: 84.0.4147.89 (Official Build) dev (64-bit)
-- | --
Revision | 19abfe7bcba9318a0b2a6bc6634a67fc834aa592-refs/branch-heads/4147@{#852}
OS | Windows 10 OS Version 1903 (Build 18362.959)

• Verified test plan from Add missing npm module licenses and detect missing ones brave-core#5561
  
  
  

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Verification passed on

Brave	1.12.102 Chromium: 84.0.4147.89 (Official Build) dev (64-bit)
Revision	19abfe7bcba9318a0b2a6bc6634a67fc834aa592-refs/branch-heads/4147@{#852}
OS	Ubuntu 18.04 LTS

• Verified test plan from Add missing npm module licenses and detect missing ones brave-core#5561

[srirambv]

Verification passed on OnePlus 6T with Android 10 running 1.12.111 x64 build

• Verified following credits are listed

array-move	parse-domain	React Sortable HOC

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Verification passed on Samsung Tab A with Android 10 running 1.12.111 x64 build

• Verified following credits are listed

array-move	parse-domain	React Sortable HOC