Fix pod install --project-directory=ios failing when Hermes is enabled

[tido64]

Summary

pod install --project-directory=ios silently fails to prep Hermes:

% pod install --project-directory=ios
[Codegen] Generating ios/build/generated/ios/React-Codegen.podspec.json
[Hermes] Downloading Hermes source code for commit 515e112edc267ad58d3c70991b3d9a721cc66b19
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0
100 9478k 0 9478k 0 0 3939k 0 --:--:-- 0:00:02 --:--:-- 5591k
[Hermes] Expanding Hermes tarball for commit 515e112edc267ad58d3c70991b3d9a721cc66b19
[Hermes] Using pre-built HermesC
[!] One or more resources were not found and will not be included in the project. If they are found later and you want to include them, run `pod install` again.
warn Multiple Podfiles were found: ios/Podfile,macos/Podfile. Choosing ios/Podfile automatically. If you would like to select a different one, you can configure it via "project.ios.sourceDir". You can learn more about it here: https://github.com/react-native-community/cli/blob/master/docs/configuration.md
Auto-linking React Native module for target `ReactTestApp`: ReactTestApp-DevSupport
Analyzing dependencies
Fetching podspec for `DoubleConversion` from `../node_modules/react-native/third-party-podspecs/DoubleConversion.podspec`
[Codegen] Found FBReactNativeSpec
Fetching podspec for `RCT-Folly` from `../node_modules/react-native/third-party-podspecs/RCT-Folly.podspec`
Fetching podspec for `boost` from `../node_modules/react-native/third-party-podspecs/boost.podspec`
Fetching podspec for `glog` from `../node_modules/react-native/third-party-podspecs/glog.podspec`
[!] No podspec found for `hermes-engine` in `../node_modules/react-native/sdks/hermes/hermes-engine.podspec`
% ls -l node_modules/react-native/sdks
total 0
hermes-engine
hermesc

Changelog

[iOS] [Fixed] - pod install --project-directory=ios fails when Hermes is enabled

Test Plan

Instead of running pod install inside ios folder, run pod install --project-directory=ios.

[tido64]

Fix for main: #33909

[hramos]

I have approved and imported #33909 and I will request these changes to be cherry-picked onto 0.69 once they land on main.