Fix flaky test_kafka_source temporary marked with xfail

[Akasurde]

Please confirm the following

• I agree to follow this project's code of conduct.
• I have checked the current issues for duplicates.
• I understand that event-driven-ansible collection is open source software provided for free and that I might not receive a timely response.

Bug Summary

test_kafka_source is flaky since we rely on stdout output from subprocess of ansible-rulebook.

Disable this test till we found better way to wait and capture subprocess output.

Environment

# ansible-rulebook --version
1.1.0
  Executable location = /usr/local/bin/ansible-rulebook
  Drools_jpy version = 0.3.9
  Java home = /usr/lib/jvm/java-21-openjdk-21.0.4.0.7-1.el9.x86_64
  Java version = 21.0.4
  Python version = 3.12.1 (main, May  3 2024, 00:00:00) [GCC 11.4.1 20231218 (Red Hat 11.4.1-3)]

Steps to reproduce

pytest tests/integration/event_source_kafka/ -s -v

Actual results

Tests are flaky which causes integration tests to fail.

Expected results

Tests pass consistently.

Additional information

No response