UI tests for payment buttons spinner

[noguier]

Summary of changes

• Added the new test to check if button becomes disabled and the animated spinner is replacing the button's logo after click

Checklist

• [ ] Added a changelog entry
• [x] Relevant test coverage
• [ ] Tested and confirmed payment flows affected by this change are functioning as expected

Authors

@noguier

[saperi22]

@noguier Consider using Kotlin for newer files.