Remove run Metro hook from Xcode build, remove launchPackager scripts

[huntie]

Summary: See proposal: https://github.com/react-native-community/discussions-and-proposals/discussions/681

Removed script files

I searched GitHub (and specifically react-native-windows/macos) to confirm these files are not referenced:

• scripts/launchPackager.bat
• scripts/launchPackager.command
• scripts/.packager.env

Interestingly, React Native CLI refers to a .packager.env at a different location (node_modules/.bin/), and includes modified copies of launchPackager.command/bat. This PR removes duplication with these.

Changelog: [iOS][Changed] Metro will no longer be started when running builds via Xcode

Differential Revision: D47297469

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D47297469

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	9,001,915	-1
android	hermes	armeabi-v7a	8,255,978	-1
android	hermes	x86	9,511,054	-1
android	hermes	x86_64	9,356,939	+0
android	jsc	arm64-v8a	9,614,949	-1
android	jsc	armeabi-v7a	8,741,584	+1
android	jsc	x86	9,701,902	-2
android	jsc	x86_64	9,948,458	+0

Base commit: c82f2e9f6816a1f946bad326e6f927018b4b05a8 Branch: main

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D47297469

[github-actions[bot]]

This pull request was successfully merged by @huntie in dc6845739e29ea8cf63583d530f67c2498286a3e.

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

[facebook-github-bot]

This pull request has been merged in facebook/react-native@dc6845739e29ea8cf63583d530f67c2498286a3e.