[CCXDEV-11831] Update log message expected when report to notify is detected

[epapbak]

Description

As part of CCXDEV-11831, I updated the log message that indicates when a report with enough impact to be notified is detected. This updates the tests where said log message is checked.

Fix for RedHatInsights/ccx-notification-service#650.

Type of change

• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Testing steps

run_in_docker.sh notification-service-tests <path_to_local_notification_service_repo_with_latest_changes>

7 features passed, 0 failed, 0 skipped
56 scenarios passed, 0 failed, 3 skipped
674 steps passed, 0 failed, 6 skipped, 0 undefined
Took 0m57.116s
+ bddExecutionExitCode=0

Checklist

• Pylint passes for Python sources
• sources has been pre-processed by Black
• updated documentation wherever necessary
• new tests can be executed both locally and within docker container
• new tests have been included in scenario list (make update-scenarios)

[tisnik]

LGTM