[Cloud Security] [AWS Orgs] CloudFormation: Validate OrganizationalUnitIds

[orestisfl]

What does this PR do?

Validate that the OrganizationalUnitIds parameter is as expected, see elastic/cloudbeat#1285

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.

Related issues

• Failure in multi-account CSPM setup when specifying non-root organization id cloudbeat#1265

[elasticmachine]

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• Start Time: 2023-08-30T05:01:42.435+0000

• Duration: 15 min 12 sec

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Test	Results
Failed	0
Passed	4
Skipped	0
Total	4

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (0/0)	💚
Files	100.0% (0/0)	💚 3.362
Classes	100.0% (0/0)	💚 3.362
Methods	25.0% (2/8)	👎 -66.828
Lines	100.0% (0/0)	💚 11.691
Conditionals	100.0% (0/0)	💚

[elasticmachine]

Package cloud_security_posture - 1.5.2 containing this change is available at https://epr.elastic.co/search?package=cloud_security_posture