feat: add email group action to send to DS

[minottic]

Description

Add email action to send emails to email lists from policies, grouped by datasets' ownergroup. This is to notify data stewards or beamline managers for jobs triggered on owned datasets. It's an opt in feature and replicates a legacy backend feature

Tests included

• Included for each change/fix?
• Passing?

Documentation

• swagger documentation updated (required for API changes)
• official documentation updated

official documentation info

Summary by Sourcery

Enable policy-driven grouped email notifications for jobs operating on datasets.

New Features:

• Add an opt-in grouped email job action that notifies each dataset owner group using recipients configured in its policy.

Enhancements:

• Support templated email subjects and bodies with configurable error handling for policy lookup and email delivery.

Documentation:

• Document the grouped email action and its policy-based notification behavior in the example job configuration.

Tests:

• Add coverage for grouping datasets, policy filtering, templating, notification delivery, and error handling.

[sourcery-ai]

Sorry @minottic, you've used your own review budget of 250,000 diff characters for the last 7 days.

You can request another review in 4 hours and 19 minutes by commenting @sourcery-ai review. Upgrade to get a review now.