[RW-90] Use AWS SES api for subscriptions

[orakili]

Refs: RW-90

This adds the possibility to use the AWS SES API to send the RW notifications.

There is notably a config setting to select the method: smtp (current) and aws_ses_bulk_api.

This also refactors slightly the templates to remove the Read more link when there is no teaser (only title + meta) to slim down the emails and notably reduce the size of the jobs emails by removing this redundant link.

Note: Testing the SES API requires a mock server. The following was used for that: https://github.com/orakili/aws-ses-v2-local.

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[cafuego]

I think this is superseded by our use of amazon_ses module.

[orakili]

There are still things to salvage from this PR, notably the email templates. Keeping it open for when I have to time to review it.