…7957)

## Explanation

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## References

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## Checklist

- [ ] I've updated the test suite for new or updated code as appropriate
- [ ] I've updated documentation (JSDoc, Markdown, etc.) for new or
updated code as appropriate
- [ ] 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)
- [ ] 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**
> Test-only timer/mocking changes plus a devDependency removal;
production code paths are unaffected, with main risk limited to subtle
fake-timer behavioral differences causing flaky tests.
> 
> **Overview**
> Switches `transaction-controller` tests that depended on Sinon clocks
over to Jest fake timers, replacing `useFakeTimers`/`clock.tickAsync`
usage with `jest.useFakeTimers`/`jestAdvanceTime`.
> 
> Adds a shared `jestAdvanceTime` helper in `tests/helpers.ts` (stepwise
async timer advancement) and drops `sinon` from
`@metamask/transaction-controller` devDependencies (and `yarn.lock`).
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
c07803e. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->