Description

We were comparing the run-exports from the lock-file against the metadata from source dependencies. However, we are not storing run-exports in the lock-file for source dependencies so this check would always fail.

This PR is split in three commits:

1. Adds a test that shows the problem locally.
2. Fixes the test by not comparing run-exports
3. Improves the satisfiability error with information about what actually changes between the metadata and the data in the lock-file.

Fixes #5226

How Has This Been Tested?

I checked the implementation against the reproducer in #5226. With this fix the lock-file is considered up-to-date. With pixi 0.63.1, the lockfile is always out of date with:

 INFO pixi_core::lock_file::outdated: the dependencies of environment 'h5py-default' for platform linux-aarch64 are out of date because the locked metadata of 'python' package changed (see trace logs for details)

AI Disclosure

I used Claude to generate the test.