docs: Add DEPPS19 for enableProductPurchaseLegacyApi deprecation

[mtrezza]

Summary by CodeRabbit

Release Notes

• Documentation
  • Updated deprecation notices with a new entry documenting the removal timeline for a legacy API configuration option.

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: f63c0dd0-cd61-4482-abcf-69cc44f70036

📥 Commits

Reviewing files that changed from the base of the PR and between 9054b62 and 436f109.

📒 Files selected for processing (1)

• DEPRECATIONS.md

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📝 Walkthrough

Walkthrough

A new deprecation entry (DEPPS19) is added to DEPRECATIONS.md for the enableProductPurchaseLegacyApi config option, following the existing format with issue reference, timeline, and status metadata.

Changes

Cohort / File(s)	Summary
Deprecation Notice DEPRECATIONS.md	Added DEPPS19 deprecation entry documenting removal timeline for enableProductPurchaseLegacyApi config option.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• feat: Add enableProductPurchaseLegacyApi option to disable legacy IAP validation #10228: Introduces the enableProductPurchaseLegacyApi config option that is now being marked for deprecation in this PR.

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