[aws] Remove unused aws.*.metrics.*.* and aws.s3.bucket.name

[kaiyan-sheng]

Proposed commit message

This PR is to remove unused aws.*.metrics.*.* and aws.s3.bucket.name from package-fields.yml file.
For some data streams when defining what metrics to collect from CloudWatch, specific metric names are listed. With the list of specific metrics, aws.*.metrics.*.* is redundant. Some data stream when defining what metrics to collect, it only specifies the namespace for CloudWatch. That way we will keep the aws.*.metrics.*.* just in case AWS adds more metrics.

For aws.s3.bucket.name it is only used in s3_daily_storage and s3_request data streams in AWS integration. Will remove the 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.

[elasticmachine]

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• Start Time: 2023-10-26T04:35:06.788+0000

• Duration: 59 min 13 sec

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Passed	212
Skipped	3
Total	215

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (17/17)	💚
Files	94.444% (17/18)	👎 -5.556
Classes	94.444% (17/18)	👎 -5.556
Methods	86.047% (259/301)	👎 -6.261
Lines	86.083% (7571/8795)	👎 -5.494
Conditionals	100.0% (0/0)	💚

[zmoog]

LGTM

[bhapas]

/test

[bhapas]

LGTM

[elasticmachine]

Package aws - 2.8.4 containing this change is available at https://epr.elastic.co/search?package=aws