fix(spotify_connect): ignore trailing sink event to prevent playback thrashing (...

fix(spotify_connect): ignore trailing sink event to prevent playback thrashing (#2976)

* fix(spotify_connect): ignore trailing sink event to prevent playback thrashing

The librespot daemon emits a trailing 'sink' event after disconnect.
MA was misinterpreting this as a new playback request, causing the
disconnecting player to immediately re-activate and steal the session back.

This adds a check to ignore 'sink' events if the session is not connected.

* Fix backport pipeline

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Co-authored-by: Marvin Schenkel <marvinschenkel@gmail.com>