Issue #3275310 by AdamPS: Improvements to phases and processors

modules/symfony_mailer_bc/src/MailManagerReplacement.php

...ailer_bc/src/Plugin/EmailBuilder/CommerceEmailBuilder.php

...mailer_bc/src/Plugin/EmailBuilder/ContactEmailBuilder.php

...er_bc/src/Plugin/EmailBuilder/ContactEmailBuilderBase.php

...er_bc/src/Plugin/EmailBuilder/ContactPageEmailBuilder.php

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

...ler_bc/src/Plugin/EmailBuilder/SimplenewsEmailBuilder.php

.../Plugin/EmailBuilder/SimplenewsNewsletterEmailBuilder.php

..._mailer_bc/src/Plugin/EmailBuilder/SystemEmailBuilder.php

..._mailer_bc/src/Plugin/EmailBuilder/UpdateEmailBuilder.php

...ny_mailer_bc/src/Plugin/EmailBuilder/UserEmailBuilder.php

...gin/EmailBuilder/UserRegistrationPasswordEmailBuilder.php

src/BaseEmailTrait.php

src/Email.php

src/EmailFactory.php

src/EmailInterface.php

src/InternalEmailInterface.php

src/Mailer.php

src/Plugin/EmailAdjuster/BodyEmailAdjuster.php

src/Plugin/EmailAdjuster/DefaultsEmailAdjuster.php