Very occasionally Xcode hasn't created an Info.plist by the time the "Thin Binary" script phase runs, which currently causes the build to fail. My guess is that Xcode is parallelizing the steps and the script phase runs right before Info.plist processing, though I'm not 100% sure why this happens.

Instead, allow the insertion to fail, knowing that it will always succeed on a second run (because the last run's Info.plist still exists). The VM service URL won't be published in the app, which means flutter attach won't work until the app is built a second time. #64988

Prefer the rarer flutter attach failing than a normal build or run.

Fixes #70422