awscloudwatch-filebeat - support milliseconds precision

[TomasMocek]

What does this PR do?

Bugfix PR based on this forums post. It makes sure that milliseconds are not removed from the message.

Why is it important?

It is very difficult to work with the logs that do not have milliseconds precision when there are multiple log messages from within the same second.

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.

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• Start Time: 2023-04-27T11:23:17.629+0000

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This pull request is now in conflicts. Could you fix it? 🙏
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[mergify]

This pull request does not have a backport label.
If this is a bug or security fix, could you label this PR @TomasMocek? 🙏.
For such, you'll need to label your PR with:

• The upcoming major version of the Elastic Stack
• The upcoming minor version of the Elastic Stack (if you're not pushing a breaking change)

To fixup this pull request, you need to add the backport labels for the needed
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• backport-v8./d.0 is the label to automatically backport to the 8./d branch. /d is the digit

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backport-8.x has been added to help with the transition to the new branch 8.x.
If you don't need it please use backport-skip label and remove the backport-8.x label.

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[mergify]

This pull request is now in conflicts. Could you fix it? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b main upstream/main
git merge upstream/main
git push upstream main