Add Amazon SES mailer chart settings

What does this MR do?

Adds chart configuration for the Amazon SES email delivery method added in gitlab-org/gitlab!242414 (merged). Self-managed instances can now configure outgoing email via the Amazon SES API using global.appConfig.amazon_ses_mailer.*, mirroring how microsoft_graph_mailer was wired up in !2784 (merged).

Omnibus MR: gitlab-org/omnibus-gitlab!9598 (merged)

Related issues

• gitlab-org/gitlab!242414 (merged) (adds the amazon_ses_mailer Rails config)
• !2784 (merged) (equivalent MR that added microsoft_graph_mailer chart settings)

Author checklist

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Required

For anything in this list which will not be completed, please provide a reason in the MR discussion.

• Merge Request Title and Description are up to date, accurate, and descriptive.
• MR targeting the appropriate branch.
• MR has a green pipeline.
• Documentation created/updated.
• Tests added/updated.
• Have you validated that your change works end-to-end on a real cluster deployment?
  • Describe how you did it in a comment.
• Equivalent MR/issue for omnibus-gitlab opened.

Reviewers checklist

• MR has a green pipeline on https://gitlab.com/gitlab-org/charts/gitlab.
• Consider downstream impact to the Operator, as per evaluating impact from changes to GitLab chart.