[SB][Call] Hide call chip timer when chip is tapped.

This aligns the call chip with the notification chips.

Bug: 414830065
Flag: android.app.ui_rich_ongoing
Test: atest CallChipViewModelTest
Test: Trigger call notification then tap call chip -> verify timer
disappears. Once HUN expires, verify timer re-appears.

Change-Id: Ib9685561b36bd0ee899867b4da382f37447b8a85