♻️ Use PHPUnit's attributes in place of annotations (#884)

[homersimpsons]

1. Used rector with the following configuration:

   <?php
   declare(strict_types=1);
   
   use Rector\Config\RectorConfig;
   use Rector\PHPUnit\Set\PHPUnitSetList;
   
   return RectorConfig::configure()
      ->withPaths([__DIR__ . '/exercises'])
      ->withSets([PHPUnitSetList::ANNOTATIONS_TO_ATTRIBUTES, PHPUnitSetList::PHPUNIT_110])
   ->withImportNames(importShortClasses: false, removeUnusedImports: true);

2. Manually fix testdox that contains :::

   -#[TestDox(specify a string type for Address::$street)]
   +#[TestDox('specify a string type for Address::$street')]

3. Updated TestGenerator.php to use attribute
4. Updated bootstrap.sh to use attribute

[github-actions]

This PR touches files which potentially affect the outcome of the tests of an exercise. This will cause all students' solutions to affected exercises to be re-tested.

If this PR does not affect the result of the test (or, for example, adds an edge case that is not worth rerunning all tests for), please add the following to the merge-commit message which will stops student's tests from re-running. Please copy-paste to avoid typos.

[no important files changed]

For more information, refer to the documentation. If you are unsure whether to add the message or not, please ping @exercism/maintainers-admin in a comment. Thank you!

[mk-mxp]

@homersimpsons So quick and so many changes :) I hope to get to it on the weekend.

[homersimpsons]

@homersimpsons So quick and so many changes :) I hope to get to it on the weekend.

Yes, it took me 30 minutes to 1 hour to check the whole diff. Most of the files had the same changes, also the diff count per file also gives confidence at a quick glance.

[tomasnorre]

Currently on vacation, so would need some time to review this, can do it somewhen next week.

[mk-mxp]

Only a few problems, automation is great!

One thing I am unsure about: Why do we have \ on students stubs exceptions, but not on those in the tests? Technically \ is not required, as there are no namespaces set. Should we remove them?

[mk-mxp]

Thanks a lot for contributing this!