fix(regions): show all for empty regions

[pedrooot]

Description

Add "all" in banner for regions when executing prowler for aws.

Checklist

• Are there new checks included in this PR? Yes / No
  • If so, do we need to update permissions for the provider? Please review this carefully.
• Review if the code is being covered by tests.
• Review if code is being documented following this specification https://github.com/google/styleguide/blob/gh-pages/pyguide.md#38-comments-and-docstrings
• Review if backport is needed.

License

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.99%. Comparing base (6f57c27) to head (651f179).
Report is 17 commits behind head on v4.3.

Additional details and impacted files

@@            Coverage Diff             @@
##             v4.3    #5143      +/-   ##
==========================================
+ Coverage   88.95%   88.99%   +0.03%     
==========================================
  Files         910      910              
  Lines       27745    27764      +19     
==========================================
+ Hits        24681    24709      +28     
+ Misses       3064     3055       -9     

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[MrCloudSec]

Could you add a test for all regions, please?

[pedrooot]

Done