[Tests] Add unit tests for hrtime utilities

[gonzaloriestra]

WHY are these changes introduced?

The hrtime utility in @shopify/cli-kit was lacking unit tests.

WHAT is this pull request doing?

Introduces unit tests for startHRTime and endHRTimeInMs in packages/cli-kit/src/public/node/hrtime.test.ts.

How to test your changes?

CI

Post-release steps

None.

Checklist

• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've considered possible documentation changes
• I've considered analytics changes to measure impact
• The change is user-facing — I've identified the correct bump type (patch for bug fixes · minor for new features · major for breaking changes) and added a changeset with pnpm changeset add

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PR created automatically by Jules for task 11795562735304887944 started by @gonzaloriestra

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