WIP: use ui_test dependency builder for test dependencies

[RalfJung]

changelog: none

This tries to make progress on rust-lang/rust#78717 by using the ui_test dependency handling instead of linking in the dependencies of clippy itself with the tests. This effectively reverts #11045.

However, it doesn't quite work. I am getting this:

command: Ok(
    (
        "quote",
        [
            "/home/r/src/rust/clippy/target/ui_test/0/debug/deps/libquote-7d753679308ff16a.rlib",
            "/home/r/src/rust/clippy/target/ui_test/0/debug/deps/libquote-7d753679308ff16a.rmeta",
        ],
    ),
) vs Ok(
    (
        "quote",
        [
            "/home/r/src/rust/clippy/target/ui_test/0/x86_64-unknown-linux-gnu/debug/deps/libquote-d21625b54f8de8ce.rlib",
            "/home/r/src/rust/clippy/target/ui_test/0/x86_64-unknown-linux-gnu/debug/deps/libquote-d21625b54f8de8ce.rmeta",
        ],
    ),
) (["lib"])

full stderr:
registry+https://github.com/rust-lang/crates.io-index#[email protected]
full stdout:
`ui_test` does not support crates that appear as both build-dependencies and core dependencies

I am not sure which exact dependencies ui_test is referring to here -- clippy_test_deps does not have any build-dependencies.

@oli-obk do you know what could be done here?

[rustbot]

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[Alexendoo]

No clue about the ui_test error, but ui-internal tests still depend on clippy_utils

[RalfJung]

Oh I see, and those are driven by the same runner. So depending on the test suite we'll need to use one or the other logic.