Remove use of announce in time_picker and remove double Feedback.forTap calls (#167241)

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This pull request replaces the use of the deprecated announce calls with
idiomatic Semantic widgets and also removes the extra `Feedback.forTap`
call. The `InkWell` widget already wraps the onTap with the
`Feedback.forTap`. I also made sure sure that existing functionality is
not impacted.

Resolves https://github.com/flutter/flutter/issues/166448
Partially addresses https://github.com/flutter/flutter/issues/165510

Physical Testing:
Android 
iOS 
Web 

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