Update UI state to connecting when connecting to suggestion

Currently, suggestions only update to the connecting state if they're
discovered. They need to update to the connecting and failure state even
if they're never scanned.

Test: atest
Bug: 417240824
Flag: com.android.media.flags.enable_suggested_device_api
Change-Id: I8fcea4ef0824d00c5b912670c67d4d7adb27ed6b