Added dormant private feature flag for drip sequences

[EvanHahn]

closes https://linear.app/ghost/issue/NY-1187

This change should have no user impact.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

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Run ID: ada4162c-3686-47ee-9a35-ec36abab1e6a

📥 Commits

Reviewing files that changed from the base of the PR and between 74ede88 and 8dd3a5f.

⛔ Files ignored due to path filters (1)

• ghost/core/test/e2e-api/admin/__snapshots__/config.test.js.snap is excluded by !**/*.snap

📒 Files selected for processing (2)

• apps/admin-x-settings/src/components/settings/advanced/labs/private-features.tsx
• ghost/core/core/shared/labs.js

✅ Files skipped from review due to trivial changes (1)

• apps/admin-x-settings/src/components/settings/advanced/labs/private-features.tsx

🚧 Files skipped from review as they are similar to previous changes (1)

• ghost/core/core/shared/labs.js

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Walkthrough

This change introduces a new "Drip Sequences" feature flag. The admin settings UI for private lab features now includes a dripSequences entry, rendering an additional toggle labeled "Enable welcome email drip sequences". The core labs configuration registers dripSequences as a private feature, adds it to the writable keys allowlist, and includes it in the aggregated flag list returned by getAllFlags(). No other functionality or public APIs were modified.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: adding a dormant private feature flag for drip sequences, matching the file modifications and PR objectives.
Description check	✅ Passed	The description is related to the changeset, referencing the linear issue and confirming the purpose of adding a dormant private feature flag for drip sequences.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

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• Commit unit tests in branch evanhahn-ny-1187-add-private-feature-flag-for-drip-sequences

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