fulfill expectations in check_partial_eq_without_eq

[B14CK313]

This is a followup to #12804, fixing a similar issue for derive_partial_eq_without_eq by using span_lint_hir_and_then instead of span_lint_and_sugg.

Additionally tests for both #[allow(clippy::derive_partial_eq_without_eq)] and #[expect(clippy::derive_partial_eq_without_eq)] are added.

changelog:[derive_partial_eq_without_eq]: fulfill expectations

[rustbot]

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[B14CK313]

Please review line clippy_lints/src/derive.rs:459 especially, there might be a better way to do this that I don't know of.

[y21]

Looks all good to me. That line also looks fine. Thank you for picking this up! :D

@bors r+

[bors]

📌 Commit 7f30b20 has been approved by y21

It is now in the queue for this repository.

[bors]

⌛ Testing commit 7f30b20 with merge f16317e...

[bors]

☀️ Test successful - checks-action_dev_test, checks-action_remark_test, checks-action_test
Approved by: y21
Pushing f16317e to master...