Rework MAD cleanup handles

[Alystrasz]

Changes

• Mod is not marked as successfully installed when the process failed;
• When mod downloading/extraction fails, mod directory is removed.

Testing

1. Install this PR;
2. Enable MAD (allow_mod_auto_download 1);
3. Try to join Space battle server and cancel mod downloading/extraction;
4. Check your local profile, the remote mod should not appear in the runtime/remote/mods directory;
5. Check your temporary directory (for me on Windows, it's C:\Users\Remy\AppData\Local\Temp), there should be no mod archive.

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Closes #756.

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TODOs

• ZIP archive is not deleted when download is cancelled (but it is when cancelling extraction)
• Mod is not removed when cancelling archive extraction

[Alystrasz]

Waiting for #815 to be merged so we have a simple way to cancel MAD process.

[wolf109909]

Tested on NorthstarCN v1.18 branch and it works fine.
Scenario 1: Unplugging ethernet while mod download is happening: Prompted mod verify or download error.
Scenario 2: Trying to join the server without ethernet connection: Immediately prompted mod verify or download error.
Scenario 3: Joining the server with Ethernet reenabled: Verify and download begins normally, with the download state being reset after the first download state update.
Overall pretty robust, but my internet restricts me from doing more stressful tests due to unstable connection speed to thunderstore and github without a proxy. (literally failed to download once even without touching my network, and the error was handled just fine ! )

[NachosChipeados]

Mod directory doesn't seem to get removed when cancelling extract
https://github.com/user-attachments/assets/1932a97b-5df1-4fef-90fa-d0ab6940ae01

Edit: turns out there was an extra Northstar.dll in my profile folder and it was messing with my testing. See the updated review below

[NachosChipeados]

Works fine, both the archive and the mod folder get deleted during the download/extract processes

2024-11-28.20-13-35.mp4

[NachosChipeados]

I think the code looks good

[GeckoEidechse]

I don't have the opportunity rn to give this is a proper review. I trust @Alystrasz with the suggested change here, especially as @NachosChipeados confirmed it working in testing.

As such merging rn without further reviews.