[Bugfix] Fix merging logic to append multiple jvm/otlp configurations

[lisguo]

Description of the issue

Currently if you try to use the "append-config" action on two configurations that have separate JVM configurations, it will fail.

Kafka Config:

{
  "metrics": {
    "namespace": "CWAgent",
    "metrics_collected": {
      "jmx": [
        {
          "endpoint": "localhost:1111",
          "kafka": {
            "measurement": [
              "kafka.request.time.avg",
            ]
          },
          "append_dimensions": {
            "ClusterName": "MyKafkaCluster"
          }
        },
        {
          "endpoint": "localhost:1111",
          "jvm": {
            "measurement": [
              "jvm.classes.loaded",
            ]
          },
          "append_dimensions": {
            "ProcessGroupName": "MyKafkaCluster"
          }
        }
      ]
    }
  }
}

Tomcat config:

{
  "metrics": {
    "namespace": "CWAgent",
    "metrics_collected": {
      "jmx": [
        {
          "endpoint": "localhost:2222",
          "tomcat": {
            "measurement": [
              "tomcat.sessions",
            ]
          },
          "append_dimensions": {
            "AppName": "MyTomcatServer"
          }
        },
        {
          "endpoint": "localhost:2222",
          "jvm": {
            "measurement": [
              "jvm.classes.loaded",
            ]
          },
          "append_dimensions": {
            "ProcessGroupName": "MyTomcatServer"
          }
        }
      ]
    }
  }
}

I expect this to merge the jvm configurations to this valid config:

{
  "metrics": {
    "namespace": "CWAgent",
    "metrics_collected": {
      "jmx": [
        {
          "endpoint": "localhost:1111",
          "kafka": {
            "measurement": [
              "kafka.request.time.avg",
            ]
          },
          "append_dimensions": {
            "ClusterName": "MyKafkaCluster"
          }
        },
        {
          "endpoint": "localhost:1111",
          "jvm": {
            "measurement": [
              "jvm.classes.loaded",
            ]
          },
          "append_dimensions": {
            "ProcessGroupName": "MyKafkaCluster"
          }
        },
        {
          "endpoint": "localhost:2222",
          "tomcat": {
            "measurement": [
              "tomcat.sessions",
            ]
          },
          "append_dimensions": {
            "AppName": "MyTomcatServer"
          }
        },
        {
          "endpoint": "localhost:2222",
          "jvm": {
            "measurement": [
              "jvm.classes.loaded",
            ]
          },
          "append_dimensions": {
            "ProcessGroupName": "MyTomcatServer"
          }
        }
      ]
    }
  }
}

Description of changes

Modify the mergeMap function in the translator to add a conditional if we see a "jmx" or "otlp" configuration, then merge the incoming jmx config into the list.

License

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Tests

Added unit test and manual testing. I appended 4 jmx configurations and see the otel receivers populated:

receivers:
    jmx/0:
        collection_interval: 1m0s
        endpoint: localhost:1111
        jar_path: /opt/aws/amazon-cloudwatch-agent/bin/opentelemetry-jmx-metrics.jar
        otlp:
            endpoint: 0.0.0.0:0
            timeout: 5s
        resource_attributes:
            ProcessGroupName: CinchJVM
        target_system: jvm
    jmx/1:
        collection_interval: 1m0s
        endpoint: localhost:2222
        jar_path: /opt/aws/amazon-cloudwatch-agent/bin/opentelemetry-jmx-metrics.jar
        otlp:
            endpoint: 0.0.0.0:0
            timeout: 5s
        resource_attributes:
            ClusterName: MyKafkaCluster
        target_system: kafka
    jmx/2:
        collection_interval: 1m0s
        endpoint: localhost:2222
        jar_path: /opt/aws/amazon-cloudwatch-agent/bin/opentelemetry-jmx-metrics.jar
        otlp:
            endpoint: 0.0.0.0:0
            timeout: 5s
        resource_attributes:
            ProcessGroupName: MyKafkaCluster
        target_system: jvm
    jmx/3:
        collection_interval: 1m0s
        endpoint: localhost:3333
        jar_path: /opt/aws/amazon-cloudwatch-agent/bin/opentelemetry-jmx-metrics.jar
        otlp:
            endpoint: 0.0.0.0:0
            timeout: 5s
        resource_attributes:
            AppName: MyTomcatServer
        target_system: tomcat
    jmx/4:
        collection_interval: 1m0s
        endpoint: localhost:3333
        jar_path: /opt/aws/amazon-cloudwatch-agent/bin/opentelemetry-jmx-metrics.jar
        otlp:
            endpoint: 0.0.0.0:0
            timeout: 5s
        resource_attributes:
            ProcessGroupName: MyTomcatServer
        target_system: jvm

Requirements

Before commiting your code, please do the following steps.

1. Run make fmt and make fmt-sh
2. Run make lint

---

Integration Tests

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[lisguo]

need to fix integ test

[jefchien]

nit: Missing coverage for merging an array into an object.