feat(MatAutocompleteHarness): Add clearText() method

[jhyot]

Feature Description

MatAutocompleteHarness has the enterText() method, which sends keys to the autocomplete input control. This means that it can only be used to add additional text. I think there is currently missing a method to clear the input.

Workaround

There is of course a workaround, to get the MatInputHarness directly and use the methods there to clear and set the control value, which works fine. But having it on the autocomplete harness would be more convenient.

Use Case

No response

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