New message for privacy pro promotion with origin

[amddg44]

Confirm message conforms to specifications: https://app.asana.com/0/1204739911139421/1208278640816845/f

To test:

• Update the privacy config URL in the app to this https://jsonblob.com/api/1316093317871755264 (which has the same changes as the privacy config PR)
• Ensure your device locale is en_US, that you are not subscribed to privacy pro but that you are eligible
• In RemoteMessagingClient.swift update the debug URL to use the staging URL from the github action below
• Launch the app and confirm the message is presented. Check the remote message pixels that are being fired and confirm a randomised subset of params are being included e.g.
  

[github-actions]

Your PR is hosted at https://staticcdn.duckduckgo.com/remotemessaging/config/staging/pre/ios-config.json

[samsymons]

@amddg44 I wasn't able to get this message to appear correctly, it was failing to match the locale; after some debugging it turns out we only support an array of locale strings, rather than a single value.

I've pushed a commit to use an array, now it looks good to me: