[8.x](backport #41572) [aws] Set region in config from GetBucketLocation API call

[mergify]

Proposed commit message

This PR sets the region of the S3 bucket as the region in AWS config to make API calls.

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.

How to test this PR locally

Without this change, run Filebeat aws-s3 input with this config and you will see error:

s3 GetObject failed: operation error S3: GetObject, https response error StatusCode: 301, RequestID: 01H7T2XWRZ6N44MW, HostID: WqYAZM+diCdCnBwj2i1tAzchSXBZql8SdIfQ0ZUCKHoR4YbMiBGD10duVYqIQ97pCg/j8MmJTgo=, api error PermanentRedirect: The bucket you are attempting to access must be addressed using the specified endpoint. Please send all future requests to this endpoint.

config:

filebeat.inputs:
- type: aws-s3
  enabled: true
  credential_profile_name: elastic-observability
  number_of_workers: 5
  bucket_arn: 'arn:aws:s3:::tkravchenko-test1'

The workaround is to add default_region: us-east-2 in the config.

With this change, Filebeat is able to get the bucket location/region from API call and assign it to the region config.

---

This is an automatic backport of pull request #41572 done by Mergify.

[botelastic]

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