Remove #![allow(unused)] and --crate-name from cargo dev new_lint generated tests

[Alexendoo]

changelog: none

Also removes some unused flags from ui-cargo tests because the entrypoint is now the Cargo.toml, not the .rs files

[rustbot]

r? @xFrednet

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[xFrednet]

Looks good to me, thanks!

@bors r+

[bors]

📌 Commit f539e1a has been approved by xFrednet

It is now in the queue for this repository.

[bors]

⌛ Testing commit f539e1a with merge 0fa1fd3...

[bors]

☀️ Test successful - checks-action_dev_test, checks-action_remark_test, checks-action_test
Approved by: xFrednet
Pushing 0fa1fd3 to master...

[Alexendoo]

Realised I didn't mention why #![allow(unused)] was removed so for posterity: we pass -A unused to tests in compile-test.rs but the old compiletest-rs crate didn't apply that when running .fixed files, ui_test does so it's no longer needed