[AWS][ECS] Add dimension fields for TSDB support

[constanca-m]

What does this PR do?

Add dimension fields to ECS datastream.

Details

To uniquely identify an ECS resource we need the service name, unique per cluster. Since we can have two clusters with the same name in the same account, we also need to set the region as dimension. There are no metrics split by labels, which make these fields be the only ones needed as a dimension.

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.
• I have verified that Kibana version constraints are current according to guidelines.

How to test this PR locally

Refer to #5894

Related issues

• Relates to [AWS][ECS] TSDB Enablement #5894

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• Start Time: 2023-05-03T15:32:19.060+0000

• Duration: 54 min 0 sec

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Name	Metrics % (covered/total)	Diff
Packages	100.0% (15/15)	💚
Files	93.75% (15/16)	👎 -3.202
Classes	93.75% (15/16)	👎 -3.202
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Package aws - 1.34.1 containing this change is available at https://epr.elastic.co/search?package=aws