Subscription-related updates

[afterxleep]

Description:

• Cherry-picking subscription-related updates from main

Steps to test this PR:

1. Smoke test subscriptions

2. Test Native redirects

• Go to any website
• Go to https://sbarag.duckduckgo.com/pro
• Go back until you get to the browser, you should be on the first page you loaded
• Open a new tab and go to https://codepen.io/marcosholgado/pen/PogEJrM
• Click on Click Here
• You should be taken to the native flow
• Go back to the browser, you should be in the same page as before
• Long tap on click here and open in a new tab
• You should be taken to the native flow
• Go back to the browser, you should be in the same page
• Long click on click here and open in a new background tab
• You should be taken to the native flow

[github-actions]

	Fails
🚫	Please, don't forget to add a link to the internal task

	Warnings
⚠️	PR has more than 500 lines of code changing. Consider splitting into smaller PRs if possible.

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