bug(mdc-tabs): animationDuration does not affect the tab indicator

[andrewseguin]

The tab config's animationDuration should affect the tab indicator.

[andrewseguin]

The general solution we expect external users to use is to just override the styles themselves by targeting the element and applying a different transition duration. However, internal users are discouraged from making these style changes.

Team has to agree whether it is worth it to sync the duration values - e.g. if the content moves twice as fast or slow, does it look right for the indicator to also go twice as fast or slow. Since this is out of spec, there is no easy correct answer

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