[AWS][S3] Add metric_type metadata to s3_daily_storage and s3_request data streams

[tetianakravchenko]

What does this PR do?

Add metric_type metadata to s3_daily_storage and s3_request data streams
All of metrics are of type gauge, since there is used an aggregation to gather those metrics - https://github.com/elastic/beats/blob/main/x-pack/metricbeat/module/aws/s3_daily_storage/manifest.yml#L7-L11

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

• [ ]

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• Start Time: 2023-06-29T08:25:40.409+0000

• Duration: 51 min 28 sec

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Total	198

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Name	Metrics % (covered/total)	Diff
Packages	100.0% (15/15)	💚
Files	93.75% (15/16)	👎 -2.769
Classes	93.75% (15/16)	👎 -2.769
Methods	85.714% (240/280)	👎 -3.537
Lines	85.925% (7387/8597)	👎 -6.047
Conditionals	100.0% (0/0)	💚

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Package aws - 1.45.8 containing this change is available at https://epr.elastic.co/search?package=aws