Woocommerce-ios: Plugins: Hide feature for non admin roles

[Ecarrion]

The plugin list endpoint wp/v2/plugins is only accessible for admin users.
To release the feature we need to hide its accessibility from the setting screen for non-admin roles.

Tasks:

• [ ] Corroborate that we can access the user's role.
• [ ] If the role is admin show the "plugin" section in the settings screen.
• [ ] Refactor code to move the plugin list synchronization out of the session manager, as we don't need to sync it at startup anymore.
• [ ] Remove feature flag.

[designsimply]

I'd like to submit some ideas early to be possible testing scenarios for later. Whether this goes into a testing guide or just guides how the feature is tested on PRs and in beta, here are some testing scenarios we can consider:

• Appropriate error appears when there is no network connection.
• Appropriate error appears when Jetpack is installed but is not activated (i.e. Jetpack was deactivated).
• Appropriate error appears when Jetpack is not installed (i.e. Jetpack was deleted).
• Plugins should appear for the following roles:
  
  
  
  • Super Admin on any multisite setup with WooCommerce and Jetpack installed and activated.
  
  
  • Administrator on any single site setup with WooCommerce and Jetpack installed and activated.
  
  
• Plugins should not appear for the following roles:
  
  
  
  • Shop Manager
  
  
  • Editor or below (i.e. logged in with a higher role and then the role was changed).
  
  
• If I deactivate a plugin on the web and then open the Plugins screens in the app, all plugin statuses should be synced and should be correct.
• If I deactivate a plugin on the web while the Plugins screen is open in the app, all plugin statuses should be updated at some interval.
• Everything should work the same when testing from WordPress.com (Atomic) vs WordPress.org (Jetpack) sites.

Note: if any of these testing ideas are not needed or won't be covered, just add a note in the comments with an explanation because it's always possible I've made assumptions that are incorrect. Thank you!