Add watchdog for property tests in cardano-cli-test

[carbolymer]

Changelog

- description: |
    Add watchdog for property tests
# uncomment types applicable to the change:
  type:
  # - feature        # introduces a new feature
  # - breaking       # the API has changed in a breaking way
  # - compatible     # the API has changed but is non-breaking
  # - optimisation   # measurable performance improvements
   - refactoring    # QoL changes
  # - bugfix         # fixes a defect
   - test           # fixes/modifies tests
  # - maintenance    # not directly related to the code
  # - release        # related to a new release preparation
  # - documentation  # change in code docs, haddocks...

Context

Our property tests sometimes hang in Hydra. This PR adds 20 seconds watchdog to each property test to ensure they're killed and fail early and do not block Hydra.

Each of our property test finishes under 5 seconds so that should be enough to catch the test hang.

Checklist

• Commit sequence broadly makes sense and commits have useful messages
• New tests are added if needed and existing tests are updated. See Running tests for more details
• Self-reviewed the diff