CI: test uucore with coreutils in codecov to run it with the proper features

[tertsdiepraam]

I think this should fix https://github.com/uutils/coreutils/pull/5783/files#r1447343162

The problem is that we were testing uucore without any features enabled, which led to a lot of tests being ignored.

In general it might be time to refactor our workflows a bit and make them a bit more uniform. The MSRV, codecov and regular builds all seem to be doing slightly different things.

[sylvestre]

Nice: codecov/project Successful in 1s — 85.67% (+0.38%) compared to cd9863d

[sylvestre]

I guess you saw:

error[E0432]: unresolved import `crate::digest`
   --> src\uucore\src/lib\features\sum.rs:487:20
    |
487 |         use crate::digest::Digest;
    |                    ^^^^^^
    |                    |
    |                    unresolved import
    |                    help: a similar path exists: `md5::digest`

error[E0432]: unresolved import `crate::digest`
   --> src\uucore\src/lib\features\sum.rs:488:20
    |
488 |         use crate::digest::DigestWriter;
    |                    ^^^^^^
    |                    |
    |                    unresolved import
    |                    help: a similar path exists: `md5::digest`

[sylvestre]

@tertsdiepraam ping ? :)

[tertsdiepraam]

Let's see :)

[tertsdiepraam]

@sylvestre seems to be good now :)