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dataengines/mpris2: Do not create a new container if there is a pending container with the same name

It's possible that a container createdin Mpris2Engine::serviceNameFetchFinished has not emitted PlayerContainer::initialFetchFinished yet, but Mpris2Engine::serviceOwnerChanged has already created a container with the same name.

A possible order that will create two containers with the same name:

1. serviceNameFetchFinished calls addMediaPlayer
2. addMediaPlayer creates a new PlayerContainer
3. Mpris2Engine::initialFetchFinished is not emitted.
4. serviceOwnerChanged watcher starts.
5. QDBusServiceWatcher::serviceOwnerChanged -> Mpris2Engine::serviceOwnerChanged
6. Mpris2Engine::serviceOwnerChanged calls addMediaPlayer
7. addMediaPlayer creates a new PlayerContainer with the same sourceName in STEP 2.
8. Crash

BUG: 446531