Remove shelljs dependency and duplicated scripts in files

[cortinico]

Summary:
We don't need to import shelljs as a dependency anymore,
plus we had a duplicated entry in the files array for package.json

Changelog:
[Internal] [Changed] - Remove shelljs dependency and duplicated scripts in files

Differential Revision: D36698750

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D36698750

[pull-bot]

	Warnings
⚠️	🔒 package.json - Changes were made to package.json. This will require a manual import by a Facebook employee.

Generated by 🚫 dangerJS against cf259ef

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
ios	-	universal	n/a	--

Base commit: 0ef73f2
Branch: main

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	7,786,274	+0
android	hermes	armeabi-v7a	7,189,932	+0
android	hermes	x86	8,097,642	+0
android	hermes	x86_64	8,075,264	+0
android	jsc	arm64-v8a	9,654,822	+0
android	jsc	armeabi-v7a	8,427,323	+0
android	jsc	x86	9,606,998	+0
android	jsc	x86_64	10,201,554	+0

Base commit: 0ef73f2
Branch: main

[react-native-bot]

This pull request was successfully merged by @cortinico in 833222f.

^{When will my fix make it into a release? | Upcoming Releases}