Add support for sprincloud logs inside the platformcloudlogs pipeline

[narph]

What does this PR do?

Add support for sprincloud logs inside the platformcloudlogs pipeline if the azure_log_forwarder.resource_type value is Microsoft.AppPlatform/Spring then logs should be transferred to springcloudlogs

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• If I'm introducing a new feature, I have modified the Kibana version constraint in my package's manifest.yml file to point to the latest Elastic stack release (e.g. ^7.13.0).

Ex:

POST _bulk 
{"create":{"_index":"logs-azure.platformlogs-default"}}
{"@timestamp":"2020-10-28T11:59:26.373Z","agent":{"name":"MicrosoftAgent","version":"1.0.0"},"data_stream":{"namespace":"default","type":"logs","dataset":"azure.platformlogs"},"input":{"type":"azure-log-forwarder"}, "azure_log_forwarder" : {"service_provider" : "Microsoft.ContainerService","category" : "kube-apiserver","resource_type": "Microsoft.AppPlatform/Spring"},"message":"""{ "time": "2021-07-01T19:30:30.535404056Z", "LogFormat": "RAW", "resourceId": "/SUBSCRIPTIONS/EDD63B67-0BA2-4837-A4EB-CD484E9FF623/RESOURCEGROUPS/SA-HEMANT/PROVIDERS/MICROSOFT.APPPLATFORM/SPRING/HM-SC-PETCLINIC", "operationName": "Microsoft.AppPlatform/Spring/logs", "category": "ApplicationConsole", "level": "Informational", "location": "westus2", "properties": {"Log":"2021-07-01 19:30:30.535 INFO 1 --- [oundedElastic-9] c.c.c.ConfigServicePropertySourceLocator : Located environment: name=admin-server, profiles=[mysql], label=null, version=638a1af7fc8d331d7eb26a571275e954632717e8, state=null\n","Stream":"stdout","AppName":"admin-server","InstanceName":"admin-server-default-12-8459d44f68-g4b5f","ServiceId":"c41fd000b1a5450eb234039376da26de","ServiceName":"hm-sc-petclinic"}}""","tags":["forwarded"],"service":{"type":"azure"},"event":{"module":"azure","dataset":"azure.platformlogs"}}

should return:

 {
        "_index" : ".ds-logs-azure.springcloudlogs-default-2021.08.10-000001",
        "_type" : "_doc",
        "_id" : "VQ3zL3sBVkyHZY6EtYa6",
        "_score" : 1.0,
        "_source" : {
          "azure_log_forwarder" : {
            "resource_type" : "Microsoft.AppPlatform/Spring",
            "service_provider" : "Microsoft.ContainerService",
            "category" : "kube-apiserver"
          },
          "agent" : {
            "name" : "MicrosoftAgent",
            "version" : "1.0.0"
          },
          "log" : {
            "level" : "Informational"
          },
          "tags" : [
            "forwarded"
          ],
          "geo" : {
            "name" : "westus2"
          },
          "cloud" : {
            "provider" : "azure"
          },
          "input" : {
            "type" : "azure-log-forwarder"
          },
          "@timestamp" : "2021-07-01T19:30:30.535Z",
          "ecs" : {
            "version" : "1.11.0"
          },
          "data_stream" : {
            "namespace" : "default",
            "type" : "logs",
            "dataset" : "azure.springcloudlogs"
          },
          "service" : {
            "type" : "azure"
          },
          "event" : {
            "agent_id_status" : "missing",
            "ingested" : "2021-08-10T12:05:05.886250800Z",
            "kind" : "event",
            "module" : "azure",
            "action" : "Microsoft.AppPlatform/Spring/logs",
            "dataset" : "azure.springcloudlogs"
          },
          "azure" : {
            "subscription_id" : "EDD63B67-0BA2-4837-A4EB-CD484E9FF623",
            "springcloudlogs" : {
              "operation_name" : "Microsoft.AppPlatform/Spring/logs",
              "log_format" : "RAW",
              "category" : "ApplicationConsole",
              "event_category" : "Administrative",
              "properties" : {
                "app_name" : "admin-server",
                "instance_name" : "admin-server-default-12-8459d44f68-g4b5f",
                "log" : """2021-07-01 19:30:30.535 INFO 1 --- [oundedElastic-9] c.c.c.ConfigServicePropertySourceLocator : Located environment: name=admin-server, profiles=[mysql], label=null, version=638a1af7fc8d331d7eb26a571275e954632717e8, state=null
""",
                "stream" : "stdout",
                "service_name" : "hm-sc-petclinic",
                "service_id" : "c41fd000b1a5450eb234039376da26de"
              }
            },
            "resource" : {
              "provider" : "MICROSOFT.APPPLATFORM/SPRING",
              "name" : "HM-SC-PETCLINIC",
              "id" : "/SUBSCRIPTIONS/EDD63B67-0BA2-4837-A4EB-CD484E9FF623/RESOURCEGROUPS/SA-HEMANT/PROVIDERS/MICROSOFT.APPPLATFORM/SPRING/HM-SC-PETCLINIC",
              "group" : "SA-HEMANT"
            }
          }
        }
      }

changing the value for azure_log_forwarder.resource_type to something else or removing it, will create the usual platformlog

[elasticmachine]

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• Start Time: 2021-08-10T14:50:21.524+0000

• Duration: 13 min 58 sec

• Commit: 0bf6337

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[elasticmachine]

Pinging @elastic/integrations (Team:Platforms)

[jsoriano]

Added pipeline LGTM. Could you please open an issue in elastic-package describing what would be needed to add pipeline tests for this? Thanks!