[8.17](backport #44304) Fix default scan_frequency to 60s

[mergify]

Proposed commit message

This PR is to fix the scan_frequency default value to 1 minute. It was set to 10s by mistake while all documentations said the default is 1m. For example: https://www.elastic.co/docs/reference/beats/filebeat/filebeat-input-aws-cloudwatch#_scan_frequency

This PR also added some debug entries around start time and end time for API calls.

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

I dont think so.

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This is an automatic backport of pull request #44304 done by [Mergify](https://mergify.com).

[botelastic]

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