Fix codegen to silence a lint that appeared with Rust 1.79 (#7578)

### What

#7563 introduced a lint that clippy chokes on with the codegen'd rust.
This PR switches off that lint in the offending places.

### Checklist
* [x] I have read and agree to [Contributor
Guide](https://github.com/rerun-io/rerun/blob/main/CONTRIBUTING.md) and
the [Code of
Conduct](https://github.com/rerun-io/rerun/blob/main/CODE_OF_CONDUCT.md)
* [x] I've included a screenshot or gif (if applicable)
* [x] I have tested the web demo (if applicable):
* Using examples from latest `main` build:
[rerun.io/viewer](https://rerun.io/viewer/pr/7578?manifest_url=https://app.rerun.io/version/main/examples_manifest.json)
* Using full set of examples from `nightly` build:
[rerun.io/viewer](https://rerun.io/viewer/pr/7578?manifest_url=https://app.rerun.io/version/nightly/examples_manifest.json)
* [x] The PR title and labels are set such as to maximize their
usefulness for the next release's CHANGELOG
* [x] If applicable, add a new check to the [release
checklist](https://github.com/rerun-io/rerun/blob/main/tests/python/release_checklist)!
* [x] If have noted any breaking changes to the log API in
`CHANGELOG.md` and the migration guide

- [PR Build Summary](https://build.rerun.io/pr/7578)
- [Recent benchmark results](https://build.rerun.io/graphs/crates.html)
- [Wasm size tracking](https://build.rerun.io/graphs/sizes.html)

To run all checks from `main`, comment on the PR with `@rerun-bot
full-check`.

crates/build/re_types_builder/src/codegen/rust/api.rs

@@ -975,6 +975,7 @@ fn quote_trait_impls_for_datatype_or_component(
                 // re_tracing::profile_function!();
 
                 #![allow(clippy::wildcard_imports)]
+                #![allow(clippy::manual_is_variant_and)]
                 use arrow2::{datatypes::*, array::*};
                 use ::re_types_core::{Loggable as _, ResultExt as _};