* fix(cloudwatch): return empty CompositeAlarms and LogAlarms from DescribeAlarms
AWS sends every alarm collection even when it is empty. Floci only sent
MetricAlarms, so the AWS CLI's text output printed a leading None line
for each missing paginator result key.
Closes#6362
* test(cloudwatch): check empty alarm collections in sdk-test-python instead of bats
Drop the new AWS CLI bats file and assert the empty CompositeAlarms and
LogAlarms lists in the existing describe_alarms test, as boto3 leaves an
absent list out of the response.
(cherry picked from commit 42f5019231b446c727d6c94def9d1445263de2d7)
Stuart Lang