Add E2E Giftcode tests

[piotr-iohk]

Will be tested on regtest, so after we move running part of the tests there.
Possible scenarios.

• Claim via deep link (cold start) - amount shows correctly, not dismissed by timed sheets
  • with no channel
  • with existing channel
• Claim via deep link (warm start) - amount shows correctly
  • with no channel
  • with existing channel
• Claim already redeemed code - shows appropriate error
• Test with an exhausted/depleted gift code

Use giftcode via deeplink:

# Android
adb shell am start \
  -a android.intent.action.VIEW \
  -d "bitkit://gift-..."


# iOS
xcrun simctl openurl booted "bitkit://gift-..."