[_]: fix/analytics for purchases

[xabg2]

Description

• Purchases made without an account are now tracked once the user finishes setting up the account from the email, so they count in GA and Impact with the right user.
• Meta still tracks these purchases as soon as the payment succeeds.
• Purchases made while logged in are tracked on the checkout success page, as before.
• Impact keeps attributing a purchase to the affiliate it came from even when the account is set up hours later.
• A purchase is only tracked for the account it was made for, never for another account created later in the same browser.
• First purchases are now correctly reported as first purchases to Impact.

Out of scope:

• Adds the missing Portuguese texts for the "item already exists" dialog.

Related Issues

Related Pull Requests

Checklist

• Changes have been tested locally.
• Unit tests have been written or updated as necessary.
• The code adheres to the repository's coding standards.
• Relevant documentation has been added or updated.
• No new warnings or errors have been introduced.
• SonarCloud issues have been reviewed and addressed.
• QA Passed

Testing Process

Additional Notes

[sonarqubecloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
93.8% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud