[aws_logs] Move default_region configuration from the advanced options

[tetianakravchenko]

Proposed commit message

Please explain:

• WHAT: Move default_region configuration to the main configuration section from the advanced options
• WHY: the download of objects (S3 polling) is silently failing without default_region set

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.
• I have verified that any added dashboard complies with Kibana's Dashboard good practices

Author's Checklist

• [ ]

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[tetianakravchenko]

TODO: check if it should be changed to true

[elasticmachine]

💚 Build Succeeded

• Buildkite Build
• Commit: bcda18f

[elastic-sonarqube]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

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0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

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[andrewkroh]

Suggested change

	link: https://github.com/elastic/integrations/pull/10789
	link: https://github.com/elastic/integrations/pull/11676

[kaiyan-sheng]

@tetianakravchenko I created a PR in Beats to fix the bug that causes this behavior. Maybe we should keep default_region in the advanced option still.

[tetianakravchenko]

@tetianakravchenko I created a elastic/beats#41572 in Beats to fix the bug that causes this behavior. Maybe we should keep default_region in the advanced option still.

@kaiyan-sheng ok, lets keep default_region in advanced option, closing this PR then