Render amp-analytics in story post type (Web Stories plugin integration)

Feature Description

We should integrate with the Web Stories plugin to place our amp-analytics snippet within stories.

Responsibilities between the two plugins should be distributed the following:

• Site Kit will take care of rendering the basic amp-analytics snippet, with tracking ID etc. Site Kit can hook into the Web Stories web_stories_print_analytics action for that.
• Web Stories will take care of adding the necessary story-specific events. Web Stories can hook into the googlesitekit_amp_gtag_opt filter for that and add the event configuration e.g. if is_singular( 'amp_story' ) (since that filter fires for any AMP context, not just stories).

Web Stories will need to make slight adjustments accordingly (see https://github.com/google/web-stories-wp/issues/1168): The plugin should remove the functionality where it renders the snippet itself (replicating a lot of Site Kit logic) and instead simply filter into Site Kit’s googlesitekit_amp_gtag_opt to add story-specific events for stories.

cc @swissspidy

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Acceptance criteria

• Site Kit should place the amp-analytics snippet based on the regular configuration in Web Stories posts (using web_stories_print_analytics).
• Secondary: Site Kit should ensure no amp-auto-ads tag is rendered for Web Stories.

Implementation Brief

• In the Analytics::register method, hook the existing $print_amp_gtag closure into web_stories_print_analytics.
• Update the Context::is_amp method to also return true if is_singular( 'web-story' ). Since that is now decoupled from the AMP plugin, but itself is always using AMP anyway, we can reliably do that.
• Update AdSense class methods where there are checks for is_singular( 'amp_story' ) to also check is_singular( 'web-story' ) in the same way. Let’s keep the amp_story ones for backward-compatibility.

QA Brief

Changelog entry

• Render amp-analytics snippet for Web Stories.

[ryanwelcher]

This looks to have been QA’d in the PR - https://github.com/google/site-kit-wp/pull/1596#pullrequestreview-420020682

[swissspidy]

IB approved 👍