Split mobile build/submit pipelines and de-duplicate OTA workflow (#11133)

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

.github/actions/setup-expo-project/action.yml

@@ -0,0 +1,47 @@
+---
+name: Setup Expo Project
+description: Install dependencies and set up the Expo/EAS CLI for a build. Does not check out the repo.
+
+inputs:
+  expo-token:
+    description: Expo token (EXPO_TOKEN secret)
+    required: true
+  eas-version:
+    description: EAS CLI version to install
+    required: false
+    default: '19.0.5'
+
+runs:
+  using: composite
+  steps:
+    - name: Check for EXPO_TOKEN
+      shell: bash
+      env:
+        EXPO_TOKEN: ${{ inputs.expo-token }}
+      run: >
+        if [ -z "$EXPO_TOKEN" ]; then
+          echo "You must provide an EXPO_TOKEN secret linked to this project's Expo account in this repo's secrets. Learn more: https://docs.expo.dev/eas-update/github-actions"
+          exit 1
+        fi
+
+    - uses: pnpm/action-setup@0ebf47130e4866e96fce0953f49152a61190b271 # v6.0.9
+
+    - name: 🔧 Setup Node
+      uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
+      with:
+        node-version-file: package.json
+        cache: pnpm
+
+    - name: 🪛 Setup jq
+      uses: dcarbone/install-jq-action@4fcb5062d7ce9bc4382d1a352d19ba3ba2c317c1 # v4.0.1
+
+    - name: ⚙️ Install dependencies
+      shell: bash
+      run: pnpm install --frozen-lockfile
+
+    - name: 🔨 Setup Expo CLI
+      uses: expo/expo-github-action@eab7a230208c952974db8c3245cfd78402c7b385 # 9.0.0
+      with:
+        eas-version: ${{ inputs.eas-version }}
+        packager: 'pnpm --allow-build=dtrace-provider'
+        token: ${{ inputs.expo-token }}