Referrals: Integrate api call for get redeem code

[SergioEstevao]

| 📘 Part of: #2083 |
|:---:|

Fixes #

1	2	3	4

To test

1. Start the app
2. Ensure you the Referrals FF enabled and you are using a Plus or Patron account
3. Go to Profile
4. Tap on the gift icon on the top left
5. Tap On Share Guest Pass
6. See the Share system view
7. Choose different types of Share and check if they work correctly and show your custom referral URL: https://pocketcasts.com/redeem/XXXXXX
8. Share and see if you go back to the profile screen.

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.

[dangermattic]

	1 Warning
⚠️	This PR is assigned to the milestone 7.74. This milestone is due in less than 2 days. Please make sure to get it merged by then or assign it to a milestone with a later deadline.

Generated by 🚫 Danger

[danielebogo]

Hey Sergio 2 small things for now:

• the card background is white
• the URL is posted twice

[SergioEstevao]

@danielebogo

the card background is white

Fixed here: fd2ce54

The double url on sharing is intentional for now, I will create a separate PR to address it. I will need to set the shared items depending of the Shared to app.

[danielebogo]

The card background color is correct now!