[MagicAction] Created didcated xml layout for magic action and

refactored shouldShowSmartReplyView to switch the layout based on
whether it is magic action.

Note: The new layout file magic_action_button.xml was forked from smart_action_button.xml, so there is no UI change in this CL.

Screenshots
Smart Action: http://screen/6AD3phjRupLyqfq
Magic Action: http://screen/4tMRr4Phczwmx59

Next
- Update magic action layout to be aligned with design spec
- Update the button animation

Test: atest SmartActionScreenshotTest
Flag: com.android.systemui.notification_magic_actions_treatment

Change-Id: I3219f59c5a54d93563b1ba2058ee54261f279ba5