prevent traces from breaking mobile app (MetaMask#8586)

## Explanation

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When calling `trace` returns undefined, trying to catch the promise will
break the app. This prevents it.

Mobile returns undefined in that callback.

## References

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## Checklist

- [X] I've updated the test suite for new or updated code as appropriate
- [X] I've updated documentation (JSDoc, Markdown, etc.) for new or
updated code as appropriate
- [X] I've communicated my changes to consumers by [updating changelogs
for packages I've
changed](https://github.com/MetaMask/core/tree/main/docs/processes/updating-changelogs.md)
- [X] I've introduced [breaking
changes](https://github.com/MetaMask/core/tree/main/docs/processes/breaking-changes.md)
in this PR and have prepared draft pull requests for clients and
consumer packages to resolve them

<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Low Risk**
> Low risk: a small defensive change in telemetry code to tolerate
`TraceCallback` implementations that return `undefined`, preventing
runtime crashes without affecting asset fetching logic.
> 
> **Overview**
> Prevents `AssetsController` telemetry from breaking the app by making
`#emitTrace` tolerate `trace` implementations that return `undefined`
(only calling `.catch()` when a promise is returned).
> 
> Updates the `assets-controller` changelog with a *Fixed* entry
documenting the trace callback handling change.
> 
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit
ee070e4. Bugbot is set up for automated
code reviews on this repo. Configure
[here](https://www.cursor.com/dashboard/bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: bergarces

packages/assets-controller/CHANGELOG.md

@@ -22,6 +22,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Bump `@metamask/transaction-controller` from `^64.3.0` to `^64.4.0` ([#8585](https://github.com/MetaMask/core/pull/8585))
 
+### Fixed
+
+- Handle trace callback returning `undefined` without throwing ([#8586](https://github.com/MetaMask/core/pull/8586))
+
 ## [6.1.0]
 
 ### Added

packages/assets-controller/src/AssetsController.ts

@@ -574,7 +574,7 @@ export class AssetsController extends BaseController<
     if (!this.#trace) {
       return;
     }
-    this.#trace({ name, data, tags }, () => undefined).catch(() => {
+    this.#trace({ name, data, tags }, () => undefined)?.catch(() => {
       // Telemetry failure must not break.
     });
   }