chore(ci): Try macos-26-xlarge runners for testflight and size-analysis

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: itaybre

.github/workflows/size-analysis.yml

@@ -92,7 +92,7 @@ jobs:
   ios:
     needs: [ready-to-merge-gate]
     name: iOS Size Analysis
-    runs-on: macos-26
+    runs-on: macos-26-xlarge
     timeout-minutes: 45
 
     steps:

.github/workflows/testflight.yml

@@ -14,7 +14,7 @@ jobs:
 
   upload_to_testflight:
     name: Build and Upload React Native Sample to Testflight
-    runs-on: macos-26
+    runs-on: macos-26-xlarge
     needs: [diff_check]
     if: ${{ needs.diff_check.outputs.skip_ci != 'true' }}
     steps: