stardust-xr-*: add tests and cleanup; stardust-xr-server: 0.44.1 -> 0.45.1

[Pandapip1]

Just a "small" update/testing PR.

TODO/Blockers

• feat: Make sk_gpu findable via cmake StereoKit/sk_gpu#32
• Add CMake discovery DanielChappuis/reactphysics3d#436
• CMake and warning fixes to allow use with KTX-Software BinomialLLC/basis_universal#408
• Add CMake install rules BinomialLLC/basis_universal#409
• Use dynamic linking to avoid unnecessary build mvvvv/StereoKit-rust#9
• build: support find_package basisu via CMake + CMake improvements BinomialLLC/basis_universal#383 (comment)

Things done

• Built on platform:
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• Tested, as applicable:
  • NixOS tests in nixos/tests.
  • Package tests at passthru.tests.
  • Tests in lib/tests or pkgs/test for functions and "core" functionality.
• Ran nixpkgs-review on this PR. See nixpkgs-review usage.
• Tested basic functionality of all binary files, usually in ./result/bin/.
• Nixpkgs Release Notes
  • Package update: when the change is major or breaking.
• NixOS Release Notes
  • Module addition: when adding a new NixOS module.
  • Module update: when the change is significant.
• Fits CONTRIBUTING.md, pkgs/README.md, maintainers/README.md and other READMEs.

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