Reduce the logging verbosity of zbus and tracing (#6261)

### What
- Resolves: #6096

### Checklist
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* Using examples from latest `main` build:
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- [PR Build Summary](https://build.rerun.io/pr/6261)
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crates/re_log/src/lib.rs

@@ -63,8 +63,10 @@ const CRATES_AT_WARN_LEVEL: &[&str] = &[
  // wgpu crates spam a lot on info level, which is really annoying
  // TODO(emilk): remove once https://github.com/gfx-rs/wgpu/issues/3206 is fixed
  "naga",
+ "tracing",
  "wgpu_core",
  "wgpu_hal",
+ "zbus",
 ];
 
 /// Never log anything less serious than a `INFO` from these crates.