[Site Design Revamp] Send recommended property with Tracks event on design selection

[antonis]

Fixes #16528

Depends on: #16510

Description

This PR adds a new property recommended to enhanced_site_creation_site_design_selected. the property is set to true if the design chosen is from the recommended category, otherwise false

To test:

To fully test this PR the group field (ref D80005) and recommended designs (ref D80579) should be available on the backend or sandbox.

Recommended design

1. Start the site creation flow
2. Proceed to the design selection
3. Tap on a design on the recommended section
4. Press Choose
5. Verify that an event is emitted with the recommended property set to true
   e.g. 🔵 Tracked: enhanced_site_creation_site_design_selected, Properties: {"template":"blog-new","default_tab_experiment":"dashboard","recommended":true}

Non-recommended design

1. Start the site creation flow
2. Proceed to the design selection
3. Tap on a design that is not recommended
4. Press Choose
5. Verify that an event is emitted with the recommended property set to false
   e.g. 🔵 Tracked: enhanced_site_creation_site_design_selected, Properties: {"template":"about","default_tab_experiment":"dashboard","recommended":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)
   Extended tests in HomePagePickerViewModelTest

PR submission checklist:

• I have completed the Regression Notes.
• 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]

You can test the changes on this Pull Request by downloading the APKs:

• Jetpack-pr-16538-build-123350.apk

• WordPress-pr-16538-build-123350.apk

[ovitrif]

Works as expected, thank you for implementing this @antonis 🙇