Add #[RunTestsInSeparateProcesses] trait to Functional and Kernel tests

Problem/Motivation

PHPUnit (Next Major) is reporting errors like:

1) Drupal\Tests\verify_email\Functional\VerifyEmailRoutingTest::testVerifyEmailRoute
Exception: Functional/FunctionalJavascript test classes must specify the #[RunTestsInSeparateProcesses] attribute
/builds/project/verify_email/web/core/tests/Drupal/Tests/BrowserTestBase.php:309
/builds/project/verify_email/tests/src/Functional/VerifyEmailRoutingTest.php:56

Steps to reproduce

View the pipeline.

Proposed resolution

• The fix should be a very simple case of adding the #[RunTestsInSeparateProcesses] before every test class.
• However, to keep phpstan (previous major) from failing, we should also add the following to .gitlab-ci.yml in the phpstan (previous major) before script:
  

  - sed -i '/#\[VerifyEmailRoutingTest\]/d' $DRUPAL_PROJECT_FOLDER/tests/src/Functional/*.php
  - sed -i '/#\[VerifyEmailRoutingTest\]/d' $DRUPAL_PROJECT_FOLDER/tests/src/Kernel/*.php
  

Remaining tasks

• Add attributes to tests.
• Add to before script to remove them for previous major.

User interface changes

None.

API changes

None.

Data model changes

None.