[Bug Report] Forceremove doesn't work if user leaves voice channel

Nobody has claimed this yet.

### Bug Description

If a user adds songs to the queue and then leaves the voice channel, `forceremove` will be unable to remove their songs, meaning that DJs are forced to use `forceskip` in each song they've added.

### Steps to Reproduce

1. User joins voice channel,
2. User adds a song,
3. User leaves voice channel,
4. Use `forceskip` it will report `Unable to find user`

### Expected Result

All user entries are deleted from the playlist.

### Debug Output

```
System Properties:
java.version = 17.0.5
java.vm.name = Eclipse OpenJ9 VM
java.vm.specification.version = 17
java.runtime.name = IBM Semeru Runtime Open Edition
java.runtime.version = 17.0.5+8
java.specification.version = 17
os.arch = aarch64
os.name = Linux

JMusicBot Information:
Version = 0.3.8
Owner = 282584705218510848
Prefix = /
AltPrefix = !
MaxSeconds = 0
NPImages = false
SongInStatus = false
StayInChannel = false
UseEval = false
UpdateAlerts = true

Dependency Information:
JDA Version = 4.4.0_352
JDA-Utilities Version = 3.0.5
Lavaplayer Version = 1.3.78

Runtime Information:
Total Memory = 54
Used Memory = 24

Discord Information:
ID = 896191407692320829
Guilds = 7
Users = 10
```

### Additional Info

Would be nice to be able to remove individual songs from other users as a DJ as well.

### Checklist

- [X] I have looked for information about this [within the documentation](https://jmusicbot.com/)
- [X] I have searched for similar issues [on the issues page](https://github.com/jagrosh/MusicBot/issues?q=is%3Aissue)
- [X] I am running the latest version of the bot: 

Start with the forceremove and forceskip command entry points and trace how queued songs are associated with users who leave the voice channel. Reproduce the reported sequence, then verify that forceremove removes all songs belonging to the departed user without requiring repeated skips. The issue provides no file or test paths, so locating the relevant queue and command code is part of the work.

Written by the indexing model from the issue text.