Use particular campaign ID format for fundraising metrics

[tonisevener]

Phabricator: https://phabricator.wikimedia.org/T352717

Notes

This PR modifies the campaign_id format when sending fundraising metrics. Note that we do still need to retain the old format and send to the submitPayment endpoint. I kept that logic as-is (generally called bannerID and is sourced from the config asset's utm_source value), but I updated all the metrics call sites to accept a new metricsID.

Test Steps (Optional)

1. Change device region to Japan, device date to May 29th. Add card to Apple Wallet.
2. Fresh install on Staging. Background, foreground, pull to refresh to fetch campaign configs.
3. Tap to article to trigger campaign modal.
4. Add breakpoint here, here and here.
5. Tap Donate button. Confirm first breakpoint is hit and campaign ID follows format enJP_2024_05_iOS.
6. Tap Apple Pay method. Submit payment. Confirm second breakpoint is hit and campaign ID follows format enJP_2024_05_iOS.
7. Continue debugging. Confirm third breakpoint is hit and banner ID follows format app_2024_JP_iOS_control. Stop Xcode now to avoid charges.

[mazevedofs]

Looking good!