Bugfix: ensure the update post type ability doesn't create new posts instead

[priethor]

What

Fixes the update post ability to require the ID, preventing the creation of new posts instead.

Why

Previously, the ability required either an ID, a key, or a slug. However, the internal acf_update_post_type creates a new post if not provided with the ID it needs to update, so updates could result in new posts.

How

• Schema change: Modified register_update_post_type_ability() to use get_post_type_with_internal_fields_schema() with only ID marked as required, making all other fields optional.
• Callback enhancement: Updated update_post_type_callback() to merge incoming input with existing post type data, ensuring that only specified fields are updated while preserving original values for the rest.

[github-actions]

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Props priethor.

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 1.17%. Comparing base (e870b55) to head (513a6d6).
⚠️ Report is 1 commits behind head on trunk.

Files with missing lines	Patch %	Lines
...cludes/abilities/class-scf-post-type-abilities.php	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             trunk    #239      +/-   ##
==========================================
- Coverage     1.17%   1.17%   -0.01%     
  Complexity    4416    4416              
==========================================
  Files          261     261              
  Lines        27017   27021       +4     
==========================================
  Hits           318     318              
- Misses       26699   26703       +4     

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[priethor]

I'll go ahead and merge this despite the codecov flag because I still need to push the e2e tests for abilities and configure codecov uploads from e2e tests.