More benchmarks for the `node:test` module.

The benchmark/test_runner folder currently contains benchmarks for it and describe functions. I suggest we expand these benchmarks to cover additional test runner features, including mocks, coverage, and various test modes.

Here are the functions that (IMO) should be benchmarked:

Basic Testing

These tests should run with a custom reporter without any special logic to make the tests as accurate as possible.

• test
  • Create a test (#56479)
  • Create a test when it's not running due to only
  • Add a subtest
  • Skip a test
    • Via skip: true
    • Via t.skip()
    • Via t.skip(...)
  • TODO tests
    • Via todo: true
    • Via t.todo()
    • Via t.todo(...)

Hooks

• beforeEach
• afterEach
• before
• after

Reporters (#55757)

• dot
• junit
• spec
• tap
• lcov

Mocking

• mock.fn (#55771)
• mock.timers for each API, and each sub-function
• mock.module

Snapshots

• snapshot.setDefaultSnapshotSerializers(serializers)
• snapshot.setResolveSnapshotPath(fn)
• t.assert.snapshot

Coverage

Use --expose-internals to exclusively test the coverage part

• Basic
• Excluding files
• Including files
• With source maps

Start in benchmark/test_runner and review the existing benchmarks for it, describe, and the completed test-runner features. Add benchmarks for the unchecked mock.timers, mock.module, snapshot, and coverage cases, using a custom reporter and --expose-internals for coverage. Done means the remaining checklist items are covered without special benchmark logic.