[PP-1] Convert test annotation to attributes in Drupal/Test/Component

The @medium annotations can no longer be associated to methods, as attributes.
Only to classes.

MR merged with 📌 TestDiscovery expects @group annotations, fails with #[Group()] attributes Active to check with TestDiscovery suppoorting #[Group] attributes.

This is blocked by 📌 TestDiscovery expects @group annotations, fails with #[Group()] attributes Active , tests with only attributes break the test discovery.

However, the MR is the pure output of the rector script indicated in the IS. So a review would be welcome - to incorporate feedback to the script.

The Needs Review Queue Bot → tested this issue. It no longer applies to Drupal core. Therefore, this issue status is now "Needs work".

This does not mean that the patch necessarily needs to be re-rolled or the MR rebased. Read the Issue Summary, the issue tags and the latest discussion here to determine what needs to be done.

Consult the Drupal Contributor Guide → to find step-by-step guides for working with issues.