[ShadowElevation] Delete swift example target since there is no input file. (#9005)
[ShadowElevation] Delete swift example target since there is no input file. (#9005)

Follow up PR to https://github.com/material-components/material-components-ios/pull/8955.
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