Fix rust wasm check not using clippy_wasm/clippy.toml (rerun-io#5987)

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### What

rerun-io#5922 broke wasm check by not
specifying the purpose made clippy.toml for wasm.


Tested by putting
```rs
        std::thread::spawn(move || {
            std::thread::sleep(std::time::Duration::from_secs(1));
        });
```
into re_space_view and then running `pixi run rs-check` (with a bunch of
checks commented out inside the rust check script) to verify that we get
the desired error.

### 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/{{pr.number}}?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/{{pr.number}}?manifest_url=https://app.rerun.io/version/nightly/examples_manifest.json)
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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)!

- [PR Build Summary](https://build.rerun.io/pr/{{pr.number}})
- [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`.

---------

Co-authored-by: Emil Ernerfeldt <[email protected]>

scripts/ci/rust_checks.py

@@ -19,7 +19,7 @@ def __init__(self, command: str, duration: float) -> None:
         self.duration = duration
 
 
-def run_cargo(cargo_cmd, cargo_args: str) -> Timing:
+def run_cargo(cargo_cmd, cargo_args: str, clippy_conf: str | None = None) -> Timing:
     args = ["cargo", cargo_cmd]
     if cargo_cmd != "deny":
         args.append("--quiet")
@@ -32,6 +32,8 @@ def run_cargo(cargo_cmd, cargo_args: str) -> Timing:
     env = os.environ.copy()
     env["RUSTFLAGS"] = "--deny warnings"
     env["RUSTDOCFLAGS"] = "--deny warnings --deny rustdoc::missing_crate_level_docs"
+    if clippy_conf is not None:
+        env["CLIPPY_CONF_DIR"] = clippy_conf
 
     result = subprocess.run(args, env=env, check=False, capture_output=True, text=True)
     if result.returncode != 0:
@@ -110,6 +112,7 @@ def main() -> None:
             run_cargo(
                 "cranky",
                 "--all-features --target wasm32-unknown-unknown --target-dir target_wasm -p re_viewer -- --deny warnings",
+                clippy_conf="scripts/clippy_wasm", # Use scripts/clippy_wasm/clippy.toml
             )
         )
         # Check re_renderer examples for wasm32.

scripts/clippy_wasm/clippy.toml

@@ -1,4 +1,4 @@
-# This is used by `scripts/clippy_wasm.sh` so we can forbid some methods that are not available in wasm.
+# This is used by `scripts/rust_checks.py` wasm checks so we can forbid some methods that are not available in wasm.
 #
 # We cannot forbid all these methods in the main `clippy.toml` because of
 # https://github.com/rust-lang/rust-clippy/issues/10406