### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

When calling 

`cloudWatchClient.EnableAlarmActions(&cloudwatch.EnableAlarmActionsInput{AlarmNames: alarmNames})`

with golang I receive a SerializationError with bytes in the error message saying: 

`<!DOCTYPE HTM |UBLIC "-//W3C//DTD HTML 3.2 Final//EN">.<title>500 Internal Server Error</title>.<h1>Internal Server Error</h1>.<p>The server encountered an internal error and was unable to complete your request. Either the server is overloaded or there is an error in the application.`

I believe this is a bug, since other cloudwatch operations like "DescribeAlarms" work flawlessly with the same client.

### Expected Behavior

I expected the call to go through without any errors

### How are you starting LocalStack?

With a `docker run` command

### Steps To Reproduce

Start localstack, create alarms and call cloudwatch "EnableAlarmActions"

### Environment

_No response_

### Anything else?

_No response_
"""
        Only used re-create persistent state. Reschedules alarms that already exist
        """
        service = "cloudwatch"
        for region in aws_stack.get_valid_regions_for_service(service):
            client = aws_stack.connect_to_service(service, region_name=region)
            result = client.describe_alarms()
            for metric_alarm in result["MetricAlarms"]:
                arn = metric_alarm["AlarmArn"]
                self.schedule_metric_alarm(alarm_arn=arn)
    def _is_alarm_supported(self, alarm_details: MetricAlarm) -> bool:
        required_parameters = ["Period", "Statistic", "MetricName", "Threshold"]
        for param in required_parameters:
            if param not in alarm_details.keys():
                LOG.debug(
                    f"Currently only simple MetricAlarm are supported. Alarm is missing '{param}'. ExtendedStatistic is not yet supported."
                )
                return False
        if alarm_details["ComparisonOperator"] not in COMPARISON_OPS.keys():
            LOG.debug(
                f"ComparisonOperator '{alarm_details['ComparisonOperator']}' not yet supported."
            )
            return False
        return True
def get_metric_alarm_details_for_alarm_arn(alarm_arn: str) -> MetricAlarm: