Change SQS metrics statistic method

[kaiyan-sheng]

Proposed commit message

This PR is to fix statistic method applied to diff metrics in SQS metricset from aws module. This change has been done in elastic/integrations#8521 but didn't make it in Beats.

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

It will not, because rename processor renamed all the fields from sqs metricset already. Users need to pay attention to the documentation change on the field description. But dashboards will not be broken.

[mergify]

This pull request does not have a backport label.
If this is a bug or security fix, could you label this PR @kaiyan-sheng? 🙏.
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
branches, such as:

• backport-v8./d.0 is the label to automatically backport to the 8./d branch. /d is the digit

[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 sqs_metrics_stats upstream/sqs_metrics_stats
git merge upstream/main
git push upstream sqs_metrics_stats

[elasticmachine]

Pinging @elastic/obs-ds-hosted-services (Team:obs-ds-hosted-services)

[vigneshshanmugam]

LGTM

[zmoog]

LGTM!