Make CargoPythonPackage the default class for extensions/components of CargoPythonBundle

[Flamefire]

(created using eb --new-pr)

[Micket]

lgtm

[Flamefire]

Note: This currently doesn't change anything because the only difference of CargoPythonPackage to PythonPackage doesn't matter (yet) for Extensions.
Maybe for the components but there currently would need to be a default easyblock anyway which I haven't seen.
Speaking of it: Should we really unconditionally overwrite the default easyblock in (Cargo)PythonBundle and ignore if it was set by the EC?

[boegel]

@Flamefire Can you clarify why this change is required?

Also, aren't we missing a return here?

[boegel]

Looks like that's just the change from another PR that is accidentally included here?

• Explictly call PythonPackage and Cargo configure step in CargoPythonPackage easyblock #3996

[Flamefire]

Indeed, the danger if --new-pr. Maybe we marge the other one first so this disappears?

As for the return: We never return anything from configure_step

[Flamefire]

This needs a small fix so it works with e.g. pymatgen-2023.12.18-foss-2023a.eb and others

https://github.com/Flamefire/easybuild-easyblocks/blob/f9ab7b091557cd3046faba9992891c50240059e6/easybuild/easyblocks/generic/cargo.py#L240C1-L240C44

this updates sources which in that case is a dictionary and hence fails (updating dict with list errors out)

Proposed fix: Convert sources to a list if it isn't one already in the __init__ call of EasyConfig

[Flamefire]

This needs a small fix so it works with e.g. pymatgen-2023.12.18-foss-2023a.eb and others

https://github.com/Flamefire/easybuild-easyblocks/blob/f9ab7b091557cd3046faba9992891c50240059e6/easybuild/easyblocks/generic/cargo.py#L240C1-L240C44

this updates sources which in that case is a dictionary and hence fails (updating dict with list errors out)

Proposed fix: Convert sources to a list if it isn't one already in the __init__ call of EasyConfig

Actually the issue was attempting to add (in this case no) crates to sources for extensions which isn't supported. Fix added
84b798d