Fulfill the lint expectation even if allowed at the type level (#14604)

`clippy::len_without_is_empty` can be allowed at the type declaration
site, and this will prevent the lint from triggering even though the
lint is shown on the `len()` method definition.

This allows the lint to be expected even though it is allowed at the
type declaration site.

changelog: [`len_without_is_empty`]: the lint can now be `#[expect]`ed
on the `len()` method even when it is `#[allow]`ed on the definining
type.

Fixes rust-lang/rust-clippy#14597

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