* Fix cloudwatchevent_rule exception handling
Where it is currently present, this change fixes the exception handling.
However, there are many places that it is lacking.
Fixes#30806
* Add new exception handling for cloudwatchevent_rule
Ensure all API calls are wrapped with exception handling
* PEP8 tidy up
* Remove unnecessary HAS_BOTO3 import and checks
Tidy up documentation so that NO_QA can be removed