[Monorepo] Fix license check errors

[Tug]

This is part of the Monorepo effort (see #18508).

Some of the dependencies gutenberg-mobile currently has are not compatible with GPLv2. #19860 will be tracking the effort to rewrite those.

This issue will track the progress of fixing the CI script that checks licenses in dependencies (see https://travis-ci.com/WordPress/gutenberg/jobs/278293062).

We'll need to fix it by either moving some dependencies to devDependencies (react-native-community/cli) and/or updating the script to exclude some specific dependencies we know won't be distributed.

We have identified the following dependencies that needs to be moved to devDependencies:

gutenberg@7.2.0
└─┬ react-native@0.60.0-patched
  └─┬ @react-native-community/cli@2.10.0
    ├─┬ @react-native-community/cli-platform-ios@2.10.0
    │ └── xcode@2.0.0                  <- Apache 2.0 license
    ├─┬ inquirer@3.3.0
    │ ├── rx-lite@4.0.8                <- Apache 2.0 license
    │ └── rx-lite-aggregates@4.0.8     <- Apache 2.0 license
    ├─┬ metro@0.54.1
    │ └─┬ jest-haste-map@24.7.1
    │   ├── fb-watchman@2.0.0          <- Apache 2.0 license
    │   └── walker@1.0.7               <- Apache 2.0 license
    └─┬ plist@3.0.1
      └── xmldom@0.1.27                <- Apache 2.0 license

[ceyhun]

Updated list of dependencies:

gutenberg@7.7.1
└─┬ @wordpress/react-native-editor@1.21.0
  └─┬ react-native@0.61.5
    ├─┬ @react-native-community/cli@3.0.4
    │ ├─┬ inquirer@3.3.0
    │ │ ├── rx-lite@4.0.8                              <- Apache 2.0 license
    │ │ └─┬ rx-lite-aggregates@4.0.8                   <- Apache 2.0 license
    │ │   └── rx-lite@4.0.8  deduped                   <- Apache 2.0 license
    │ ├─┬ metro@0.56.4
    │ │ ├─┬ metro-inspector-proxy@0.56.4
    │ │ │ └── rxjs@5.5.12                              <- Apache 2.0 license
    │ │ └─┬ yargs@9.0.1
    │ │   └─┬ read-pkg-up@2.0.0
    │ │     └─┬ read-pkg@2.0.0
    │ │       └─┬ normalize-package-data@2.4.0
    │ │         └─┬ validate-npm-package-license@3.0.3 <- Apache 2.0 license
    │ │           ├── spdx-correct@3.0.0               <- Apache 2.0 license
    │ │           └─┬ spdx-expression-parse@3.0.0
    │ │             └── spdx-exceptions@2.1.0          <- Apache 2.0 license
    │ ├─┬ metro-config@0.56.3
    │ │ └─┬ metro@0.56.3
    │ │   └─┬ metro-inspector-proxy@0.56.3
    │ │     └── rxjs@5.5.12                            <- Apache 2.0 license
    │ └─┬ metro-core@0.56.3
    │   └─┬ jest-haste-map@24.7.1
    │     ├─┬ fb-watchman@2.0.0                        <- Apache 2.0 license
    │     │ └── bser@2.0.0                             <- Apache 2.0 license
    │     ├─┬ fsevents@1.2.9
    │     │ └─┬ node-pre-gyp@0.12.0
    │     │   └── detect-libc@1.0.3                    <- Apache 2.0 license
    │     ├─┬ sane@4.1.0
    │     │ ├── @cnakazawa/watch@1.0.3                 <- Apache 2.0 license
    │     │ ├── fb-watchman@2.0.0  deduped             <- Apache 2.0 license
    │     │ └── walker@1.0.7  deduped                  <- Apache 2.0 license
    │     └── walker@1.0.7 
    └─┬ @react-native-community/cli-platform-ios@3.0.0
      └── xcode@2.1.0                                  <- Apache 2.0 license