Cherry-pick #22941 to 7.x: Add clusterName, taskName, cloud.region and dashboard to aws fargate

[kaiyan-sheng]

Cherry-pick of PR #22941 to 7.x branch. Original message:

What does this PR do?

This PR is to add extra fields for cluster name, task name, cloud region and an identifier for AWS fargate.

Why is it important?

When creating AWS Fargate tasks with the same container/container name, Kibana dashboard get confused and only displaying part of the data. I would like to introduce an awsfargate.identifier = containerName + "/" + containerID to make sure we can distinguish containers from different task or cluster.

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

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Build stats

• Build Cause: Pull request #23026 opened

• Start Time: 2020-12-09T15:14:38.228+0000

• Duration: 55 min 2 sec

Test stats 🧪

Test	Results
Failed	0
Passed	2702
Skipped	596
Total	3298

Steps errors

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Terraform Apply on x-pack/metricbeat/module/aws

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Terraform Apply on x-pack/metricbeat/module/aws

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Test stats 🧪

Test	Results
Failed	0
Passed	2702
Skipped	596
Total	3298