Issue #3228605 by omrmankar, AdamPS: Fix Drupal coding standard and Drupal Practice

..._mailer_bc/src/Plugin/EmailBuilder/LegacyEmailBuilder.php

modules/symfony_mailer_bc/symfony_mailer_bc.api.php

modules/symfony_mailer_bc/symfony_mailer_bc.install

modules/symfony_mailer_bc/symfony_mailer_bc.module

src/BaseEmailInterface.php

src/BaseEmailTrait.php

src/Controller/SymfonyMailerController.php

src/Email.php

src/EmailFactory.php

src/EmailInterface.php

src/Entity/MailerPolicy.php

src/Form/PolicyAddForm.php

src/Form/PolicyEditForm.php

src/Form/TransportForm.php

src/InternalEmailInterface.php

src/Mailer.php

src/MailerHelper.php

src/MailerInterface.php

src/MailerTransportListBuilder.php

src/Plugin/EmailAdjuster/AddressAdjusterBase.php