[Gallery Refactor] Analytics

[chipsnyder]

Description

This adds the results of the unstableGalleryWithImageBlocks setting to the editor_session_start event so that we can monitor how many of our users have migrated to the new gallery refactor over time.

This builds off of #16832

To test:

Setup

1. A site running Gutenberg generated from [Mobile] Pass the Gallery v2 Flag over from the editor WordPress/gutenberg#33314. You can use wp-env start or generate a new bundle.
2. On your site enable the Gallery Refactor by going to Gutenberg > Experminents > Check "Gallery Refactor"

Enable Gallery Refactor

1. Navigate to the Editor
2. Expect to see the event editor_session_start contain the property unstableGalleryWithImageBlocks with the value true

Disable Gallery Refactor

1. Navigate to the Editor
2. Expect to see the event editor_session_start contain the property unstableGalleryWithImageBlocks with the value false

Regression Notes

1. Potential unintended areas of impact
   N/A

2. What I did to test those areas of impact (or what existing automated tests I relied on)
   N/A

3. What automated tests I added (or what prevented me from doing so)
   N/A

PR submission checklist:

• I have completed the Regression Notes.
• I have considered adding unit tests for my changes.
• I have considered adding accessibility improvements for my changes.
• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

[peril-wordpress-mobile]

You can trigger optional UI/connected tests for these changes by visiting CircleCI here.

[peril-wordpress-mobile]

	Warnings
⚠️	PR is not assigned to a milestone.

Generated by 🚫 dangerJS

[chipsnyder]

@antonis I added a property to the editor_session_start so that we can report on the use of Gallery v2. I'm only 50/50 on this one though but I thought it's better to have it and not use it than need it and not have it. Let me know your thoughts.

[antonis]

@antonis I added a property to the editor_session_start so that we can report on the use of Gallery v2. I'm only 50/50 on this one though but I thought it's better to have it and not use it than need it and not have it. Let me know your thoughts.

I totally agree with that Chip. We better have this information available even if we don't use it.
The code changes LGTM btw. I'll get back to this to fully test the PR.

[peril-wordpress-mobile]

You can trigger an installable build for these changes by visiting CircleCI here.

[antonis]

Great work @chipsnyder 👍
The code LGTM and the app works as expected 🎉

[chipsnyder]

Merging this into the base branch as a landing spot before moving to develop