chore(e2e): add clear-updates restart crash regression check to update flow

[floydkim]

Background

This change hardens an E2E regression path for a past runtime issue: potential crash after calling clearUpdates and then restartApp.

Changes

• Updated e2e/flows/03-update-flow.yaml to add a regression check at the end of the update flow:
  • start from an installed update state
  • tap Clear updates
  • tap Restart app
  • assert the app is still running (React Native.* is visible)
  • assert the installed update marker is gone (UPDATED! is not visible)
• Re-applies the update at the end of the same flow to restore the expected startup state for the next rollback phase (flows-rollback), which assumes an update is already installed.

Expected Impact

• The E2E suite now explicitly guards the clearUpdates + restartApp path against runtime crash regressions.
• The existing phase order remains stable because 03-update-flow now preserves the expected precondition for phase 2.