updated build instructions for RN Tester in Apple silicon based machines

[Biki-das]

Summary:
I was trying to build the rn-tester app on Apple Silicon Mac (M3 Pro) and encountered build failures with command PhaseScriptExecution failed with a nonzero exit code. Installing Rosetta 2 resolved this issue, indicating it's required for proper x86_64 command execution on Apple Silicon. This PR documents this requirement.
Changelog:
[INTERNAL] [FIXED] - updated build instructions for RN Tester in Apple silicon based machines
Test Plan:
Running xcworkspace in Xcode resulted in error, now the app builds successfully.

[react-native-bot]

	Warnings
⚠️	📋 Missing Summary - Can you add a Summary? To do so, add a "## Summary" section to your PR description. This is a good place to explain the motivation for making this change.
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[Biki-das]

cc @huntie @hoxyq

[facebook-github-bot]

@EdmondChuiHW has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[cortinico]

I was trying to build the rn-tester app on Apple Silicon Mac (M3 Pro) and encountered build failures with command PhaseScriptExecution failed with a nonzero exit code. Installing Rosetta 2 resolved this issue, indicating it's required for proper x86_64 command execution on Apple Silicon

That's actually not necessary. I've been building RNTester on a M1 Max without rosetta installed without problems. You probably had a different issue.
@cipolleschi can also tell you more about M1 support for building React Native.

[Biki-das]

Yeah i might be wrong but can we execute x84 commands? if rosetta is not installed by default, i was getting the hermes phase execution error. As i installed rosetta, it happened to make build successfully.

[cipolleschi]

@Biki-das I suggest you to expand the error in Xcode to actually understand what you are missing.
Rosetta is not necessary, but there are a number of possible causes for the error you are seeing:

1. you have not setup the NODE_BINARY variable properly in your xcode.env.local file
2. you might have a stale version of Hermes
3. Some other issue we have to investigate.