Issue #3576673: Move mail_cancel_test hook into MailTest kernel test using #[Hook] attribute

Sujal Kshatrirequested to merge
issue/drupal-3576673:main into main

Issue #3576673: Move mail_cancel_test hook into MailTest kernel test using #[Hook] attribute
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  • Moved hook_mail_alter implementation into MailTest\
  • Removed mail_cancel_test test module\
  • Updated @see reference

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