Fix rust axum doc tests (#19538)

[faro-dr]

Fixes the Rust doc tests generated by rust-axum. The doc tests used an invalid should_panic attribute, probably a typo.

For reference, this is how a doc test that is expected to panic should look like: https://doc.rust-lang.org/rustdoc/write-documentation/documentation-tests.html#attributes

Sorry for not providing a minimal OpenAPI spec to reproduce the issue but I think the problem is obvious and the fix is trivial enough.

@frol @farcaller @richardwhiuk @paladinzh @jacob-pro

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[wing328]

@faro-dr thanks for the PR

cc @linxGnu

[linxGnu]

LGTM. I apologize for late reply due to personal matters.

[wing328]

@linxGnu @faro-dr I updated the samples via 577483c but CI reported errors: https://github.com/OpenAPITools/openapi-generator/actions/runs/11158288924/job/31014249053

can you please take a look when you've time?

[faro-dr]

@wing328 I just had a look at 577483c: it contains more changes than just those introduced by this PR. Apparently, some type models::FormTestRequest is missing/wasn't generated but I'm quite sure it isn't caused by this PR.

[linxGnu]

@faro-dr
Seem like there are changes in the sample inputs and require us to set:

globalProperties:
  skipFormModel: "false"

Fixed with: #19920