per #39709

We need to:

• Fix parsing regionname from custom endpoints like s3.us-east-1.bills.domain.com. See https://github.com/elastic/beats/pull/39709/files#diff-589195ecff44ed2c6bf097da676822765ae86c2e73fc5789aaf0a64d8bb26ff1R349-R377 for an example fix. Should probably go here:

  beats/x-pack/filebeat/input/awss3/sqs.go

  Lines 41 to 43 in 05c5957

  	}
  	// check for sqs queue url

• Use the default endpoint resolver if the endpoint begins with s3. See: https://github.com/elastic/beats/pull/39709/files#diff-589195ecff44ed2c6bf097da676822765ae86c2e73fc5789aaf0a64d8bb26ff1R78-R92 for an example fix. Should probably go here: https://github.com/elastic/beats/blob/main/x-pack/filebeat/input/awss3/input.go#L51-L60