[#1670][Dialogs] Remove hardcoded InputHint for AttachmentPrompt #1671
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#minor -> replace for fixes x when promoted
Fixes #1670
Description
This PR fixes the issue with the attachment prompt forcing the Input Hint on prompt and adds a new unit test to validate the change.
Specific Changes
attachment_prompt.py
that force the input_hint.test_attachment_prompt_with_input_hint
that uses an activity with the input hint set, and validates that when used the properties are not changed.Testing
Below is the added unit test working before and after the change is applied.

And below is the 05.multi-turn botbuilder sample using the library with the changes applied.
