feat!: remove the empty suite from the runner

[sheremet-va]

Description

This PR removes the default empty suite that was reported with all tasks and led to a few confusing bugs:

• It always existed even if the test was not inside any suites
  • Because of this test names had an empty string at the start
  • Custom reporters had to check for the id/name of the internal suite to correctly report results
• All tasks now have a file property they can fallback to if they need the file information
• expect.getState().testPath is always defined now
• expect.getState().currentTestName doesn't have the file anymore

Fixes #4045

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.
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Tests

• Run the tests with pnpm test:ci.

Documentation

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

Changesets

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