chore: test cucumber improvements

[SWvheerden]

Description

[gemini-code-assist]

Code Review

This pull request introduces a standardized wait_for! macro with exponential backoff to replace various manual polling loops across the integration test suite. This change improves code readability and consistency. However, the reviewer identified several instances where the transition to the new macro significantly reduced timeout durations compared to the original implementations. These reductions, found in both node and wallet synchronization steps, could lead to flaky tests in environments where operations take longer than the new 120-second default or the specific hardcoded values. It is recommended to adjust these timeouts to match the previous, more generous durations to ensure test stability.