[MA 3325] Config to opt for including element behind a modal on iOS

[amanjeetsingh150]

Proposed changes

By default, iOS snapshots hide elements behind modals due to the snapshotKeyHonorModalViews flag being enabled. However, we've seen cases where elements visibly present on sheets are not captured properly — they're treated as if they're part of a container attached to the main window and not the sheet, and thus excluded.

This results in missing elements in the hierarchy even though they're visibly rendered on screen.

This PR introduces platform config to make a way to safely roll these features out.

• This would be switched to default false in future
• Users would have a way to opt out in cases test break.

executionOrder:
  flowsOrder:
    - flowB
    - flowC
    - flowD

platform: 
    ios: 
      snapshotKeyHonorModalViews: false

Impact

This improves visibility of UI elements rendered behind modals (e.g., sheets, alerts) during flow execution. Since this behavior changes how the hierarchy is built, it is opt-in to avoid breaking existing flows.

Testing

• Customer flow locally
• Sharding case

[linear]

MA-3325 P0 - DSDSingleOrderSingleItemFlow: Dasher app iOS

[github-actions]

Make sure to run ./maestro-ios-xctest-runner/build-maestro-ios-runner.sh with every swift change