fix: add_hook and add_test handling

[noomorph]

I noticed that in an flat test file:

// my.test.js
metadata.set('key', 'value');

for some weird reason gets assigned to a hook, and not to ROOT_DESCRIBE_BLOCK, like I'd expect initially.

It turned out that my handling of add_hook and add_test was slightly incorrect – they should not permanently set currentMetadata to a test/hook definition.

So, what I'm doing now is to set a special listener which fires last and re-focuses the current metadata to the current describe block. This should help.

[github-actions]

🎉 This PR is included in version 1.5.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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