Sharing: create a "Sharing Buttons" block

[andrewserong]

Related Epic: #31920

Related to #19659 (essentially the same task for the Like button feature)

This issue is to implement a simple MVP server side rendering block for the "Share this" feature that gets automatically appended to the end of post content. Ideally in full site editing, a user should be able to place this feature where they like within a template part.

As an example, the below screenshot is a mock up of moving out the Like button feature to a Footer template part. Here, it's clear that it would be good for the user to also be able to place the "Share this" feature elsewhere within the page:

Tasks

• Create a block for the Sharing feature (and come up with a clear name for it)
  • In the editor, use a static approximation of the feature
  • On the front end, add a server side render_block method that calls the existing sharing_display method
• If an FSE theme is active, prevent the automatic sharing_display from appending the "Share this" feature to post content (it's registered against the_content filter here, and the logic lives here )
• Ensure the existing settings to hide the sharing feature on an individual post or globally, still applies to the block version

---

### Tasks
- [ ] https://github.com/Automattic/jetpack/issues/34050
- [ ] https://github.com/Automattic/jetpack/pull/34085
- [ ] https://github.com/Automattic/jetpack/issues/34108
- [ ] https://github.com/Automattic/jetpack/issues/34115
- [ ] https://github.com/Automattic/jetpack/issues/34116
- [ ] https://github.com/Automattic/jetpack/issues/34324
- [ ] https://github.com/Automattic/jetpack/issues/34325
- [ ] https://github.com/Automattic/jetpack/issues/34326
- [ ] https://github.com/Automattic/jetpack/issues/34327
- [ ] https://github.com/Automattic/jetpack/issues/34521
- [ ] https://github.com/Automattic/jetpack/issues/34580
- [ ] https://github.com/Automattic/jetpack/issues/34581
- [ ] https://github.com/Automattic/jetpack/issues/34596
- [ ] https://github.com/Automattic/jetpack/issues/34726
- [ ] https://github.com/Automattic/jetpack/issues/35047
- [ ] https://github.com/Automattic/jetpack/issues/35141
- [ ] https://github.com/Automattic/jetpack/issues/35143
- [ ] https://github.com/Automattic/jetpack/pull/35267
- [ ] https://github.com/Automattic/jetpack/issues/34621
- [ ] https://github.com/Automattic/jetpack/issues/34575
- [ ] https://github.com/Automattic/jetpack/issues/35286

[jeherve]

Also in pdHDFB-8-p2

[lakellie]

Just noting that we had a user contact us requesting this functionality in 5648078-zen

[github-actions]

Support References

This comment is automatically generated. Please do not edit it.

• 5648078-zen
• 6169722-zen
• 7148193-zen

[jeherve]

Also suggested in pdHDFB-m-p2

[thekingsprojects]

Had a user confused by the lack of sharing buttons in their Query Loop block, expecting them to be available there: 6169722-zen