[8.17](backport #43369) x-pack/filebeat/input/awss3: allow a grace time on shutdown

[mergify]

Proposed commit message

x-pack/filebeat/input/awss3: allow a grace time on shutdown

We may have SQS message requests in flight that are being serviced when the
input's context is cancelled. This allows the user to specify a time to wait
after the context is cancelled before the processing and publication work is
terminated.

We finish as soon as the set of pending requests had been received and
published, cut short after the grace time.

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.

Disruptive User Impact

Author's Checklist

• [ ]

How to test this PR locally

Related issues

• Closes [Crowdstrike FDR] Handle deduplication integrations#13062

Use cases

Screenshots

Logs

---

This is an automatic backport of pull request #43369 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of c0d439c has failed:

On branch mergify/bp/8.17/pr-43369
Your branch is up to date with 'origin/8.17'.

You are currently cherry-picking commit c0d439ce3.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   CHANGELOG.next.asciidoc
	modified:   x-pack/filebeat/input/awss3/config.go
	modified:   x-pack/filebeat/input/awss3/config_test.go
	modified:   x-pack/filebeat/input/awss3/sqs_input.go
	modified:   x-pack/filebeat/input/awss3/sqs_test.go

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   docs/reference/filebeat/filebeat-input-aws-s3.md

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[botelastic]

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