feat(ec2): add new fixer ec2_ebs_public_snapshot_fixer

[danibarranqueroo]

Context

Develop a fixer that reconfigures EBS snapshots to restrict public accessibility, ensuring they are only accessible within authorized AWS accounts or specific VPCs. This will protect sensitive data from being exposed to the public, securing critical information stored within the EBS snapshots.

For the unit tests, I've tried to use moto but it didn't work as expected, I've also tried to mock volumes as it's done in the unit tests of the check ec2_ebs_public_snapshot, but this created lots of snapshot so it was not easy to handle, so finally I decided to use Botocore.

Also, an additional consideration is that I didn't realized that I commited the changes from this PR on this branch, so those changes are here to, that's why I need the reviewer to go to the other PR first.

Description

Added new fixer ec2_ebs_public_snapshot_fixer with its unit tests.

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 89.89%. Comparing base (09ea6ba) to head (06bf2e1).
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5825      +/-   ##
==========================================
+ Coverage   89.87%   89.89%   +0.01%     
==========================================
  Files        1137     1138       +1     
  Lines       35462    35472      +10     
==========================================
+ Hits        31871    31887      +16     
+ Misses       3591     3585       -6     

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