Split Hermes build for iOS on different executors to speed up CI and Releases

[cipolleschi]

Summary:

This PR splits the build of Hermes for iOS in multiple jobs.

Before, we were building all the slices of Hermes serially. So, we were:

• building the hermesc
• building hermes for iPhone
• building hermes for iPhonesimulator
• building hermes for Macos
• building hermes for Catalyst
• packaging the framework
  This job was taking up to 45-50 minutes.

The the four slices (iPhone, iPhonesimulator, Macos, Catalyst) can be parallelized to harvest a speedup in execution.
The following tables contains the executions before and after this change.

• Full Clean Build -> Before: 51' 35" | After: 17'33" ( 3x improvement)

BEFORE	AFTER
Total time (critical path): build_hermes_macos-Debug = 51' 35"	Total time (critical path): build_hermesc_apple (2' 56") + build_apple_slices_hermes-Debug-macosx (9'23") + build_hermes_macos-Debug (5'14") = 17'33"

• Fully Cached Build -> Before: 4'35" | After: 32" ( 9x improvement)

BEFORE	AFTER
Total Time (critical path): build_hermes_macos-Debug (4'35")	Total Time (critical path): build_hermesc_apple (7") + build_apple_slices_hermes-Debug-macosx (7") + build_hermes_macos-Debug (32") = 46"

Changelog:

[Internal] - Split hermes build to speedup CI and Release

Test Plan:

• CircleCI stays green
• Hermes artifact still works for RNTester and app from the template

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	8,894,300	-1
android	hermes	armeabi-v7a	7,942,876	+4
android	hermes	x86	9,292,201	-1
android	hermes	x86_64	9,193,733	-3
android	jsc	arm64-v8a	9,480,955	-1
android	jsc	armeabi-v7a	8,422,520	-1
android	jsc	x86	9,464,982	-3
android	jsc	x86_64	9,779,239	-2

Base commit: 1f24750
Branch: main

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[cipolleschi]

/rebase

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[github-actions]

This pull request was successfully merged by @cipolleschi in 79122ab.

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