Description

This PR adds hooks to the TestAPI (test), that provide type-safe ExtraContext.

Details can be viewed here: #8617.

Please don't delete this checklist! Before submitting the PR, please make sure you do the following:

• It's really useful if your PR references an issue where it is discussed ahead of time. If the feature is substantial or introduces breaking changes without a discussion, PR might be closed.
• Ideally, include a test that fails without this PR but passes with it. -> Not sure how I could achieve this here, as it would be a type error.
• Please, don't make changes to pnpm-lock.yaml unless you introduce a new test example.
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Tests

• Run the tests with pnpm test:ci.

Tests fail on my branch, but the same tests also fail on the main branch. So it doesn't seem to be related to this PR changes.

Documentation

• If you introduce new functionality, document it. You can run documentation with pnpm run docs command.

Changesets

• Changes in changelog are generated from PR name. Please, make sure that it explains your changes in an understandable manner. Please, prefix changeset messages with feat:, fix:, perf:, docs:, or chore:.