BREAKING CHANGE: Rename the `selected` index property on md-tabs to `activeTabIndex` (`active-tab-index` attribute). Rename `select-on-focus` to `auto-activate`
PiperOrigin-RevId: 564437639
BREAKING CHANGE: remove `variant` attributes and change `md-tab` to `md-primary-tab`, or `md-secondary-tab` if using `variant="secondary"
PiperOrigin-RevId: 561077231