Mac_ios high_bitrate_images fails almost everytime on the staging bots e.g flutter-devicelab-mac-10 and flutter-devicelab-mac-39 are failing Mac_ios high_bitrate_images tasks in the staging pool, but they are exhibiting different failure logs.

Observed Behavior:

Bot: flutter-devicelab-mac-10(https://chromium-swarm.appspot.com/bot?id=flutter-devicelab-mac-10)

Task: 74fff443aa7dd910

Error: Explicitly fails at the step u/install_xcode/Failed_to_install_Xcode.

Bot: flutter-devicelab-mac-39(https://chromium-swarm.appspot.com/bot?id=flutter-devicelab-mac-39)

Task: 75053d86d7862210

Error: Fails with a generic exit status 1 at the end of the run, but lacks the specific Failed_to_install_Xcode step in the logs.

I suspect that it might be related to the recent macOS 15.7 upgrade. Both bots are identifying as Mac-15.7.2. The inconsistency in logging makes it difficult to confirm if mac-39 is facing the exact same Xcode issue or a different environment failure.