Gutenboarding site setup: use selected features to recommend plan

[razvanpapadopol]

Changes proposed in this Pull Request

• Get selected_features from site options (see Gutenboarding: use selected_features when creating a site #45578 which added this property) and recommend a plan during Site Setup flow.

Testing instructions

• Go to /new.
• Select some features on /new/features step and create the site.
• Apply the diff and sandbox the site.
• Start Site setup flow in editor and on Select a plan step, Recommended plan should be displayed.

Screenshot

Fixes #45148

[matticbot]

Test live: https://calypso.live/?branch=add/gutenboarding-site-setup-selected-features

[matticbot]

Here is how your PR affects size of JS and CSS bundles shipped to the user's browser:

App Entrypoints (~12 bytes removed 📉 [gzipped])

name                 parsed_size           gzip_size
entry-gutenboarding        +87 B  (+0.0%)      -12 B  (-0.0%)

Common code that is always downloaded and parsed every time the app is loaded, no matter which route is used.

Legend

What is parsed and gzip size?

Parsed Size: Uncompressed size of the JS and CSS files. This much code needs to be parsed and stored in memory.
Gzip Size: Compressed size of the JS and CSS files. This much data needs to be downloaded over network.

Generated by performance advisor bot at iscalypsofastyet.com.

[matticbot]

Caution: This PR affects files in the Editing Toolkit Plugin on WordPress.com
Please ensure your changes work on WordPress.com before merging.

D49718-code has been created so you can easily test it on your sandbox. See this FieldGuide page about developing the Editing Toolkit Plugin for more info: PCYsg-ly5-p2

[ciampo]

Thank you @razvanpapadopol for helping us test these changes. Code changes LGTM