[SB] Clean up BluetoothRepository

This change moves BluetoothRepository into a data/repository
package. Also, use kosmos for BluetoothRepositoryImplTest

Bug: 414890231
Test: BluetoothConnectionStatusInteractorTest
Flag: com.android.systemui.status_bar_system_status_icons_in_compose
Change-Id: I60d1b349c98391d37c01702f0c09933ea950e041