userEvent.setup should not be awaited

This issue concerns [@bam.tech/await-user-event](https://github.com/bamlab/react-native-project-config/tree/main/packages/eslint-plugin/docs/rules/await-user-event.md)

`setup` is the only function of the `userEvent` object that doesn't return a promise, this should not be awaited.

`userEvent.setup` is called in every test file that uses `userEvent`, outside function blocks. This makes this rule unusable so far.

What can be done:
- detect if the function returns a promise
- explicitly exclude `setup` of this rule

Start with packages/eslint-plugin/docs/rules/await-user-event.md and trace the corresponding rule implementation. Reproduce the warning for userEvent.setup in a test file, then verify the rule no longer flags setup while still checking awaits for the other userEvent functions.

Written by the indexing model from the issue text.