[iOS] Fix build fail when "ipconfig getifaddr" does not have IP

[nochkin]

One of the build phase scripts fails when IP is assigned to non-en0 interface because "ipconfig getifaddr en0" exits with 1 when IP is not assigned to en0. That produced "PhaseScriptExecution failed with a nonzero exit code" in Xcode. The patch fixes this issue by removing "set -e" and re-enabling it later in the script.

Summary:

iOS build fails during Bundle React Native code and images phase.
The actual error message is PhaseScriptExecution failed with a nonzero exit code.
After doing some debugging it appears the issue is within scripts/react-native-xcode.sh and was introduced in the commit a56e5da

The patch removes "set -e" and re-enables it after looping through interfaces. Also, added the original commit comment to explain why it's been added there initially.

Changelog:

[IOS][FIXED] Fix the build failure when "en0" does not have IP assigned

Test Plan:

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[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	16,513,656	-3
android	hermes	armeabi-v7a	n/a	--
android	hermes	x86	n/a	--
android	hermes	x86_64	n/a	--
android	jsc	arm64-v8a	19,884,253	+9
android	jsc	armeabi-v7a	n/a	--
android	jsc	x86	n/a	--
android	jsc	x86_64	n/a	--

Base commit: eb661df
Branch: main

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[dmytrorykun]

Unfortunately this is not the right fix. The purpose of having -e in this script is to bubble the error to the Xcode build pipeline and to fail the entire build if the jdbundle couldn't be created.
Closing in favour of #41839

[nochkin]

@dmytrorykun
Actually, it would still bubble out the error because "set -e" is present in the script, but I agree on another fix as it looks cleaner.
Thank you for your feedback.

[dmytrorykun]

@nochkin sorry, you're right, I somehow missed that -e didn't go away completely, but just moved to a different line 😕