modrinth-app-unwrapped: refactor and use pnpm hooks

[TomaSajt]

Description of changes

pnpm_*.configHook was added some time ago, and this package wasn't yet using it, so I refactored the package to use it.

I also simplified the way it's decided which bundle to generate. I can revert this, if needed.

In another commit (that I will merge into the first one, if decided that it's an improvement) I made the package use mkDerivation combined with cargoSetupHook, since that's the only functionality that the package was using anyway (because the build phase is overridden).
This allowed getting rid of the rec added in the first commit.

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Note: the theseus repo has been renamed to code and combined into a monorepo. I didn't update the repo of fetchFromGitHub yet, just wanted to share this.
It seems that upstream is only keeping the tag for the latest version of the package in the code repo. Might need to ask them to start tagging properly.

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 24.11 Release Notes (or backporting 23.11 and 24.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

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[getchoo]

The new pnpm hooks have already been adopted in #336494 along with some other fixes/improvements. Regarding the other refactors here

• I'm not sure why we would switch to mkDerivation

  • The only real benefit is with improved overriding, but I don't think that's worth the cost of us reconstructing parts of buildRustPackage
  • It will be mostly moot after #335751, which is meant to work alongside rustPlatform to easily control build profiles, flags, cross compilation, etc.

• The way bundles are generated is a lot more naive in regards to platform support

  • Currently it's much easier to add more platforms in an attrset rather than constantly adding on to an if .. else if chain
  • Will also be moot after #335751

[TomaSajt]

Regarding the other refactors here

* I'm not sure why we would switch to `mkDerivation`
  
  * The only real benefit is with improved overriding, but I don't think that's worth the cost of us reconstructing parts of `buildRustPackage`
  * It will be mostly moot after [cargo-tauri.hook: init #335751](https://github.com/NixOS/nixpkgs/pull/335751), which is meant to work alongside `rustPlatform` to easily control build profiles, flags, cross compilation, etc.

* The way bundles are generated is a lot more naive in regards to platform support
  
  * Currently it's much easier to add more platforms in an attrset rather than constantly adding on to an `if .. else if` chain
  * Will also be moot after [cargo-tauri.hook: init #335751](https://github.com/NixOS/nixpkgs/pull/335751)

Ah, thanks, didn't know about that PR. Great to hear that it exists.
I'll probably close this PR then.

[TomaSajt]

The new pnpm hooks have already been adopted in #336494 along with some other fixes/improvements.

Ah, I forgot to search for existing PR, I should remember to do that more often.