[AWS] [API Gateway] Add metrics dashboard filters, control groups and clean up

[lucian-ioan]

A new issue will be made to document exactly why these additional documents are being generated and if there's a dashboard level solution for filtering them properly.

What does this PR do?

1. Adds filter based on aws.dimensions.Stage to ensure that only documents containing this dimension are considered while visualizing the data. This is necessary due to extra documents currently being present in the metrics:

The lucian-REST-PetStore API has 2 stages (dev, prod), each with 32 and 64 aws.apigateway.metrics.Count.sum respectively, representing the number of requests made to them.

However, another document is present in the metrics with the combined number of requests (96) which also has no aws.dimensions.Stage present.

2. Adds control groups using aws.dimensions.ApiId (HTTP, WebSocket), aws.dimensions.ApiName (REST) and aws.dimensions.Stage (REST, HTTP and WebSocket), as well as AWS Region.

3. Removes unused lens ([WebSocket] Latency) because the metric is only for HTTP/REST.

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.

Author's Checklist

• [ ]

How to test this PR locally

Related issues

• Closes [AWS] [API Gateway] Add metrics dashboard filters, control groups and clean up #7723

Screenshots

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• Start Time: 2023-09-07T15:32:22.051+0000

• Duration: 56 min 8 sec

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Name	Metrics % (covered/total)	Diff
Packages	100.0% (17/17)	💚
Files	94.444% (17/18)	👎 -2.21
Classes	94.444% (17/18)	👎 -2.21
Methods	85.953% (257/299)	👎 -6.338
Lines	86.024% (7509/8729)	👎 -2.31
Conditionals	100.0% (0/0)	💚

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Package aws - 2.2.0 containing this change is available at https://epr.elastic.co/search?package=aws