[Catalog] Use the breadcrumb for the example's title.
[Catalog] Use the breadcrumb for the example's title.

This removes the need to duplicate the example's title and standardizes the behavior between MDCCatalog and MDCDragons. Prior to this change, only MDCDragons was using the breadcrumb as the example's title.

PiperOrigin-RevId: 307589086

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