fix(autocomplete): auto-highlighted first option not display correctly if the floating label is disabled

[crisbeto]

Fixes the first option not appearing as highlighted if the consumer has set floatLabel="never" and autoActiveFirstOption. It looks like we were depending on the transitioned event from the label to kick off the change detection that shows the highlight.

Fixes #13734.

[crisbeto]

Caretaker note: this is a resubmit of #13774 which had to be reverted due to sync issues.

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