[aws] Change include_linked_accounts default to true

[kaiyan-sheng]

What does this PR do?

This PR is to change include_linked_accounts default to true to match metricbeat: elastic/beats#35686

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.

[elasticmachine]

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Build stats

• Start Time: 2023-09-18T17:16:34.969+0000

• Duration: 53 min 55 sec

Test stats 🧪

Test	Results
Failed	0
Passed	209
Skipped	3
Total	212

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[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (17/17)	💚
Files	94.444% (17/18)	👎 -2.142
Classes	94.444% (17/18)	👎 -2.142
Methods	85.953% (257/299)	👎 -6.317
Lines	86.024% (7509/8729)	👎 -2.284
Conditionals	100.0% (0/0)	💚

[elasticmachine]

Package aws - 2.3.0 containing this change is available at https://epr.elastic.co/search?package=aws