remove aws-ses prefix from runner classes.

[alice-carr]

What problem does this pull request solve?

We have recently switched to using ses for confirmation emails from notify. Since we are now only using one mail delivery method, we do no need to specify that they are using ses.

Trello card: https://trello.com/c/GfBTJbNL/3154-use-ses-to-send-all-confirmation-emails

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• Do the commit messages explain why the changes were made?
• Are there all the unit tests needed?
• Do the end to end tests need updating before these changes will pass?
• Has all relevant documentation been updated?

[github-actions]

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