fix: make conda-pypi-map relative to manifest

[rHermes]

This makes the conda-pypi-map file path relative to the pixi manifest, which makes the behavior independent of which directory you execute pixi from.

This resolves issue #2615

[rHermes]

I see that I broke some of the tests, I'll update this later today

[rHermes]

I am a bit lost on what the error is here, and my limited rust and Pixi knowledge is a blocker. Could you point me in the right direction @Hofer-Julian ?

[Hofer-Julian]

I am a bit lost on what the error is here, and my limited rust and Pixi knowledge is a blocker. Could you point me in the right direction @Hofer-Julian ?

Thanks for your contribution @rHermes.
That specific job is flaky unfortunately, nothing to do with your changes.

I don't see though how your changes to the tests actually test that relative mappings now work correctly :)

[rHermes]

Ah no they don't, I was trying to preserve the original setup of the tests and maybe adding a specific test to check for the relative nature. What do you think about this?

[Hofer-Julian]

Ah no they don't, I was trying to preserve the original setup of the tests and maybe adding a specific test to check for the relative nature. What do you think about this?

Yes, please do that :)