Cherry-pick #23469 to 7.x: Rename s3 input to aws-s3 input

[kaiyan-sheng]

Cherry-pick of PR #23469 to 7.x branch. Original message:

What does this PR do?

This PR is to rename Filebeat s3 input to aws-s3 input.
Closes elastic/integrations#488

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

1. Test the Filebeat aws-s3 input:

filebeat.inputs:
- type: aws-s3
  enabled: true
  queue_url: https://sqs.eu-central-1.amazonaws.com/428152502467/filebeat-aws-elb-test
  credential_profile_name: elastic-beats

This should start aws-s3 input with no error.

2. Test Filebeat filesets that use aws-s3 input:

./filebeat modules enable aws

and change modules.d/aws.yml to enable a fileset in aws module. For example:

- module: aws
  cloudtrail:
    enabled: true
    var.queue_url: https://sqs.us-east-1.amazonaws.com/428152502467/test-fb-ks
    var.credential_profile_name: elastic-beats

Then run Filebeat and you should see no error. If there are new logs going into the S3 which generates new SQS messages in test-fb-ks, you should also see the events in Elasticsearch.

[elasticmachine]

Pinging @elastic/ingest-management (Team:Ingest Management)

[elasticmachine]

Pinging @elastic/integrations (Team:Platforms)

[botelastic]

This pull request doesn't have a Team:<team> label.

[elasticmachine]

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Build stats

• Build Cause: Pull request #23573 opened

• • Start Time: 2021-01-19T17:09:33.595+0000

• Duration: 54 min 38 sec

• Commit: 820be3c

Test stats 🧪

Test	Results
Failed	0
Passed	6528
Skipped	586
Total	7114

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Test stats 🧪

Test	Results
Failed	0
Passed	6528
Skipped	586
Total	7114

[blakerouse]

Backport looks good.