[Suggested Folders] New CTA flow

[SergioEstevao]

| 📘 Part of: #https://github.com/orgs/Automattic/projects/1278 |
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Fixes #2803

This PR updates the Suggested folders flow:

• Use the same screen for CTA and regular flow
• Add the warning about replacing folders inline to the screen and only show it if the user already has folders.
• When the user has folders the CTA button changes to Replace folders
• Updates analytics events
• Improve upsell flow in order to only track changes when the actual flow starts

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To test

• Clean install the app on a real device
• Ensure that you have the Feature Flag enabled. Profile -> Settings -> Beta Features -> SuggestedFolders

New user

• Start the app and skip login or signup
• If needed go to Discover tab and subscribe to at least 8 podcasts
• Go to Podcasts tab
• Check if the Suggested Folders show up ( you may need to wait up to 10s after startup)
• Tap on the close button
• Check if the Suggested Folders do not show again automatically when switching tabs
• Go back to Podcasts tab
• Tap on Folder icon on the top left
• Check if the Suggested folders screen is show
• Tap on Use these folders button
• Check if the Upsell for folders is shown
• Complete the IAP flow using a Testflight AppStore sandbox account and upgrade to Plus
• Check if the Smart folders screen is shown after the IAP flow is completed successfully
• Tap on Use these folders
• Confirm
• Check if the suggested folders are applied.

User with subscription

• After you finished the regular cycle above now using the same user do the following steps
• Go to Podcasts tab
• Check if the Suggested Folders do not show again automatically when switching tabs
• Go back to Podcasts tab
• Delete one of the existing folders
• Tap on Folder icon on the top left
• Check if the Suggested folders screen is show
• Check if the screen shows replace folders button
• Tap on Replace folders button
• Check if the confirmation screen is shown
• Tap on Replace Folders to confirm
• Check if the suggested folders are applied.
• Tap on Folder icon on the top left
• Tap on Create manual folder
• Check if manual flow is shown and works correctly

Checklist

• I have considered if this change warrants user-facing release notes and have added them to CHANGELOG.md if necessary.
• I have considered adding unit tests for my changes.
• I have updated (or requested that someone edit) the spreadsheet to reflect any new or changed analytics.