[Banner] Remove AppBar example snapshot tests because the animation involved causes flakiness.
[Banner] Remove AppBar example snapshot tests because the animation involved causes flakiness.

PiperOrigin-RevId: 324623184

material-components/material-components-ios,material-components/material-components-ios,material-components/material-components-ios,material-components/material-components-ios,material-components/material-components-ios