Sync: do not sync comments made via Action Scheduler

[jeherve]

Follow-up of #12830.

Fixes #13354

Changes proposed in this Pull Request:

Action Scheduler is used to schedule and run background jobs on WordPress, and is used extensively by WooCommerce and WooCommerce extensions.

The data is currently stored in a custom post type, and as such it appears in WordPress.com' activity log even though it does not provide a lot of value to site owners:

In #12830, I stopped posts from that Post Type from being synchronized with WordPress.com, but that wasn't enough. This PR aims to stop the comments from being synchronized as well.

Here is an example of a comment we are trying to catch with this:

'WP_Comment Object
(
    [comment_ID] => 3468
    [comment_post_ID] => 25402
    [comment_author] => ActionScheduler
    [comment_author_email] =>
    [comment_author_url] =>
    [comment_author_IP] =>
    [comment_date] => 2019-08-28 18:33:41
    [comment_date_gmt] => 2019-08-28 09:33:41
    [comment_content] => action created
    [comment_karma] => 0
    [comment_approved] => 1
    [comment_agent] => ActionScheduler
    [comment_type] => action_log
    [comment_parent] => 0
    [user_id] => 0
    [children:protected] =>
    [populated_children:protected] =>
    [post_fields:protected] => Array
        (
            [0] => post_author
            [1] => post_date
            [2] => post_date_gmt
            [3] => post_content
            [4] => post_title
            [5] => post_excerpt
            [6] => post_status
            [7] => comment_status
            [8] => ping_status
            [9] => post_name
            [10] => to_ping
            [11] => pinged
            [12] => post_modified
            [13] => post_modified_gmt
            [14] => post_content_filtered
            [15] => post_parent
            [16] => guid
            [17] => menu_order
            [18] => post_type
            [19] => post_mime_type
            [20] => comment_count
        )

)
'

(matching blog ID is 114940227)

Is this a new feature or does it add/remove features to an existing part of Jetpack?

• If you're an Automattician, include a shortlink to the p2 discussion with Jetpack Product here.

Testing instructions:

• Switch your Woo site to run that branch for a few days.
• You should spot no events from ActionScheduler in your activity log.
• You should still be able to use things like the Woo mobile app, or the Woo Store in Calypso.

Proposed changelog entry for your changes:

• Activity Log: avoid displaying events from the Action Scheduler.

[jeherve]

@roccotripaldi If you have the chance I'd love to have your review on this since you worked on a related PR a little while ago.

Thank you!

[jetpackbot]

Thank you for the great PR description!

When this PR is ready for review, please apply the [Status] Needs Review label. If you are an a11n, please have someone from your team review the code if possible. The Jetpack team will also review this PR and merge it to be included in the next Jetpack release.

Scheduled Jetpack release: September 3, 2019.
Scheduled code freeze: August 27, 2019

Generated by 🚫 dangerJS against b560ba7

[kraftbj]

Adding this to a live WC site to confirm.

[kraftbj]

Works as advertised.