Added redemption_type to Offers Content API

[sagzy]

ref https://linear.app/ghost/issue/BER-3258/disable-offer-link-for-retention-offers

• The new field redemption_type is set to signup for signup offers (default) and to retention for retention offers
• With this change, we expose the redemption_type in Content API, so that it can be used by Portal to handle offers differently, based on their redemption type. For instance, retention offers are triggered during the cancellation flow and cannot be redeemed via an offer link

[coderabbitai]

📝 Walkthrough

Walkthrough

The Content API serializer for offers has been updated to include the redemption_type field in its output, sourced from the jsonModel object. The change is minimal with one line added and maintains existing functionality for non-Content API paths.

Changes

Cohort / File(s)	Summary
Offers Serializer Enhancement ghost/core/core/server/api/endpoints/utils/serializers/output/mappers/offers.js	Added redemption_type field to Content API serialized output, mapping from jsonModel.redemption_type.

Poem

🐰 A little field hops into view,
Redemption type, so fresh and new,
The offer mapper spreads its cheer,
One tiny line makes it all clear! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately reflects the main change: adding the redemption_type field to the Offers Content API serializer.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch add-offers-redemption-type-to-content-api

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