chore(network-enablement-controller): replace Sinon with Jest fake timers

[cryptodev-2s]

Explanation

References

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
• I've introduced breaking changes in this PR and have prepared draft pull requests for clients and consumer packages to resolve them

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Note

Low Risk
Test-only and dependency cleanup change; main risk is subtle timing differences causing flaky tests rather than runtime behavior changes.

Overview
Removes sinon from @metamask/network-enablement-controller dev dependencies and updates the lockfile accordingly.

Migrates NetworkEnablementController.test.ts from Sinon fake timers to Jest fake timers by switching setup/teardown to jest.useFakeTimers()/jest.useRealTimers() and replacing advanceTime({ clock, ... }) calls with jestAdvanceTime(...).

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