Titles of make blogs are messed up

[samuelsidler]

The titles of all make blogs are duplicated. e.g.:

"Make WordPress CoreMake WordPress Core"

[samuelsidler]

Otto, can you review this?

[Otto42]

Looks good to me. Fixed in [61].

[SergeyBiryukov]

Related: #39

## Summary

Register the _wp_note_reactions comment meta in wp_create_initial_comment_meta(), alongside the existing _wp_note_status meta. This meta stores emoji reaction data for the block editor's collaborative Notes feature.

### Data Model

Each emoji key (e.g., "👍", "❤️") maps to an array of reaction objects:

{
  "👍": [
    { "userId": 1, "date": "2025-01-15T10:30:00" },
    { "userId": 2, "date": "2025-01-15T11:00:00" }
  ],
  "❤️": [
    { "userId": 1, "date": "2025-01-15T10:35:00" }
  ]
}

### REST Schema

• Type: object
• Single: true
• Default: [] (empty array)
• additionalProperties: Each property is an array of objects with:
  • userId (integer) — The reacting user's ID
  • date (string|null, date-time format) — When the reaction was added

### Auth

Uses the same edit_comment capability check as _wp_note_status.

## References

• Gutenberg PR: ​https://github.com/WordPress/gutenberg/pull/75148
• Trac ticket: (to be created)

---

This is a code-review-only PR. The corresponding Trac ticket will be created and linked.

I have updated this backport PR to apply the custom comment type approach for storage used in ​https://github.com/WordPress/gutenberg/pull/75549 which replaces the meta based approach in ​https://github.com/WordPress/gutenberg/issues/75144.