chore(aws): cleanup aws test cases and standardize checks

[madereddy]

Context

Clean up AWS test cases to meet prowler standards.

Description

Fix Redshift checks to report back the cluster id instead of cluster ARN.

Fix Organization checks to standardize starting with "AWS Organizations {org.id} as different checks within Organization had different starting points.

Fix S3 check to standardize start with S3 Bucket {bucket.name} and cleanup verbiage.

Cleanup AWS test cases to remove assert search for Redshift, Organizations, and S3.

License

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[sergargar]

Looks good, thanks @madereddy !

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 86.27%. Comparing base (716d388) to head (e8627f6).
Report is 3 commits behind head on master.

Files	Patch %	Lines
...ny_regions/organizations_scp_check_deny_regions.py	60.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4053      +/-   ##
==========================================
- Coverage   86.34%   86.27%   -0.08%     
==========================================
  Files         783      783              
  Lines       24537    24562      +25     
==========================================
+ Hits        21187    21190       +3     
- Misses       3350     3372      +22     

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