Update campaign ID format sent with GPay transaction. #4946
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The campaign ID that is sent to the fundraising API needs to be updated to match the format used by iOS, which is:
language+campaignID+_+platform. (note no underscore between language and ID, and underscore between ID and platform)This will enhance and simplify analytics.
Phabricator:
https://phabricator.wikimedia.org/T367360