bachinger 175c64a07b Track controllers that don't await the connection
This removes some stack traces in unit tests when a
`RemoveMediaController` was created with `waitForConnection=false`
in which case the missing controller in the
`MediaControllerProviderService` caused a `NullPointerException`.

PiperOrigin-RevId: 546795181
2023-07-13 15:24:12 +01:00
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