test: add missing test files

Author: baszalmstra

tests/data/workspaces/output-dependencies/README.md

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+# Output Dependencies Test Workspace
+
+This workspace contains a simple test package used to test the `get_output_dependencies` function.
+
+## Structure
+
+- `test-package/`: A package with build, host, and run dependencies
+  - Build dependencies: cmake, make
+  - Host dependencies: zlib, openssl
+  - Run dependencies: python, numpy

tests/data/workspaces/output-dependencies/pixi.toml

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+[workspace]
+channels = []
+platforms = []
+preview = ["pixi-build"]

tests/data/workspaces/output-dependencies/test-package/pixi.toml

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+[package]
+name = "test-package"
+version = "0.1.0"
+
+[package.build]
+backend = { name = "in-memory", version = "*" }
+
+[package.build-dependencies]
+cmake = ">=3.0"
+make = "*"
+
+[package.host-dependencies]
+openssl = ">=3.0"
+zlib = ">=1.2"
+
+[package.run-dependencies]
+numpy = ">=1.20"
+python = ">=3.8"