chore: add mail modules

[lazysoundsystem]

Refs: OPS-9523

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PHP 8.2.14 (cli) (built: Dec 21 2023 20:19:50) (NTS) Copyright (c) The PHP Group Zend Engine v4.2.14, Copyright (c) Zend Technologies with Zend OPcache v8.2.14, Copyright (c), by Zend Technologies with Xdebug v3.3.0, Copyright (c) 2002-2023, by Derick Rethans Composer version 2.6.6 2023-12-08 18:32:26

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Pusher: @cafuego, Action: pull_request, Workflow: Run tests

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[lazysoundsystem]

@cafuego - as per original instructions, I'm not planning to merge any of these (i.e. OPS-9523-add-mail-modules branches for any of the repos) - do say if that would be helpful, otherwise I'll leave it to you when you're ready..

[cafuego]

@lazysoundsystem They should all be safe to merge as they are; that will prevent the need to fix merge conflicts after the next security update so you may as well.

My plan is to apply the proposed config for using msmtp on dev and SES on prod to GMS, then update core.extensions.yml to enable the modules, then apply it to other properties. And then NEVER EVER ROTATE AWS CREDENTIALS AGAIN :-)