convert circleci mac and ios workflows to github actions (#44032)

Summary:
This pull request converts the CircleCI workflows to GitHub actions workflows. This change only inlcudes the mac and ios build and test jobs.

## Changelog:
[Internal] - Migrate iOS to github actions

Pull Request resolved: https://github.com/facebook/react-native/pull/44032

Test Plan:
[Here is the latest workflow run in my fork](https://github.com/robandpdx-org/react-native/actions/runs/8637660560).

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https://fburl.com/workplace/f6mz6tmw

Reviewed By: NickGerleman

Differential Revision: D56581393

Pulled By: cipolleschi

fbshipit-source-id: a806b1a274e3d86c03e66a543360a800187855e4

.github/actions/setup-xcode/action.yml

@@ -0,0 +1,14 @@
+name: Setup xcode
+description: 'Set up your GitHub Actions workflow with a specific version of xcode'
+inputs:
+  xcode-version:
+    description: 'The xcode version to use'
+    required: false
+    default: '15.2'
+runs:
+  using: "composite"
+  steps:
+    - name: Setup xcode
+      uses: maxim-lobanov/setup-xcode@60606e260d2fc5762a71e64e74b2174e8ea3c8bd
+      with:
+        xcode-version: ${{ inputs.xcode-version }}