Adjust output package.json formatting in scripts

[huntie]

Summary: I noticed inconsistent handling of terminating newlines in D54006327@V1, and had also been noticing yarn build reformatting unrelated sections of package.json files.

For now, this logic isn't moved to a shared util, since there will likely be a higher level abstraction for the release scripts in the next batch of improvements.

Changelog: [Internal]

Reviewed By: lunaleaps

Differential Revision: D54007565

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D54007565

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D54007565

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D54007565

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	17,935,062	+5
android	hermes	armeabi-v7a	n/a	--
android	hermes	x86	n/a	--
android	hermes	x86_64	n/a	--
android	jsc	arm64-v8a	21,293,286	+8
android	jsc	armeabi-v7a	n/a	--
android	jsc	x86	n/a	--
android	jsc	x86_64	n/a	--

Base commit: b9f3186ee6314f56863c05272640d47643709a39 Branch: main

[facebook-github-bot]

This pull request has been merged in facebook/react-native@30b088d245f449874806f26d2b79b756242cbc94.