Forms: Try register post type form builder

[enejb]

⚠️ Do not merge.

This is a quick experiment in creating a post type for jetpack forms.

Things I tried.
I wasn't able to make the custom post type editable in the site-editor.php

Other things that would be neat.

Inspired by the wp_navigation post type.

Some things. I wasn't able to lock down the form fully you are still able to add items outside of the form block. 🙃

List View

Editor View

Proposed changes:

Other information:

• Have you written new tests for your changes, if applicable?
• Have you checked the E2E test CI results, and verified that your changes do not break them?
• Have you tested your changes on WordPress.com, if applicable (if so, you'll see a generated comment below with a script to run)?

Jetpack product discussion

Does this pull request change what data or activity we track or use?

Testing instructions:

• Go to '..'

[github-actions]

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[github-actions]

Are you an Automattician? Please test your changes on all WordPress.com environments to help mitigate accidental explosions.

• To test on WoA, go to the Plugins menu on a WordPress.com Simple site. Click on the "Upload" button and follow the upgrade flow to be able to upload, install, and activate the Jetpack Beta plugin. Once the plugin is active, go to Jetpack > Jetpack Beta, select your plugin, and enable the try/form-builder-post_type branch.

• To test on Simple, run the following command on your sandbox:

  bin/jetpack-downloader test jetpack try/form-builder-post_type
  

Interested in more tips and information?

• In your local development environment, use the jetpack rsync command to sync your changes to a WoA dev blog.
• Read more about our development workflow here: PCYsg-eg0-p2
• Figure out when your changes will be shipped to customers here: PCYsg-eg5-p2

[github-actions]

Code Coverage Summary

Coverage changed in 1 file.

File	Coverage	Δ%	Δ Uncovered
projects/packages/forms/src/class-jetpack-forms.php	0/82 (0.00%)	0.00%	70 💔

Full summary · PHP report · JS report

[github-actions]

This PR has been marked as stale. This happened because:

• It has been inactive for the past 3 months.
• It hasn’t been labeled `[Pri] BLOCKER`, `[Pri] High`, etc.

If this PR is still useful, please do a [trunk merge or rebase](https://github.com/Automattic/jetpack/blob/trunk/docs/git-workflow.md#keeping-your-branch-up-to-date) and otherwise make sure it's up to date and has clear testing instructions. You may also want to ping possible reviewers in case they've forgotten about it. Please close this PR if you think it's not valid anymore — if you do, please add a brief explanation.

If the PR is not updated (or at least commented on) in another month, it will be automatically closed.

[github-actions]

This PR has been automatically closed as it has not been updated in some time. If you want to resume work on the PR, feel free to restore the branch and reopen the PR.