[R-2] Enable Enhanced Conversions (EC) for GL&A

[sstopfer]

Overview

This is a tracking issue for enabling Enhanced Conversions in the plugin.

The goal of this requirement is to allow users the option to configure Enhanced Conversions, through Google Listings & Ads in order to improve performance of existing conversion measurement, by supplementing conversion tags with first party customer data in a privacy safe way.

Developer Documentation: https://developers.google.com/google-ads/api/docs/conversions/enhanced-conversions/web

Requirements Overview

R 2.1 – Develop post-onboarding pop-up modal panel to configure enhanced conversions

• [x] #2239 Add a page to the SubmissionSuccessGuide panel to enable Enhanced Conversions
• [x] Develop a REST API endpoint for reading ToS status (via #2242)
• [x] Develop a REST API endpoint for reading/writing ToS Enhanced Conversions status (via #2242)
• [x] Integrate REST API endpoints with the success modal EC page (via #2242)
• [x] Update gtag and purchase conversions when EC is enabled (via #2258)

R 2.2 – Develop a panel in the Google Listings & Ads Settings Tab to manage the current enhanced conversion activation state

The behavior when this is enabled should follow the same ToS logic described in R2.1

• [x] Add panel in Google Listings & Ads Settings Tab that shows the current enhanced conversion activation state

### Updated Requirements
- [ ] Update Enhanced Conversions onboarding flow #2364

[joemcgill]

The UX for this feature has been updated. New details are in #2364.

[joemcgill]

This will be superseded by #2454. Closing.