(#3281) Add validation for cache folder permissions

[AdmiringWorm]

Description Of Changes

These changes introduces a new validation check to ensure that
the system cache folder that is used for storing NuGet responses
have been properly locked down to administrators.

When the directory exists, and allows modifications or creations of
files by normal user this will output a validation warning about steps
that can be taken to lock down the directory.

When the directory does not exist, this same validation check ensure
that the directory is created while only allowing Administrators to
modify, create or delete anything in the folder.

Motivation and Context

We should do what we can to prevent malicious users to make modifications to something that can have reporcussions for the user that is installing a package.

Testing

Elevated tests

1. Create directory C:\ProgramData\ChocolateyHttpCache and delete any log files
2. Run the command choco search vcredist140
3. Validate the following warning is
   
4. Validate log file contains
   
5. Delete folder C:\ProgramData\ChocolateyHttpCache and log file
6. Run choco search vcredist140
7. Validate no warning is shown in console
8. Validate log file contains
   
9. Delete log file again (Do not remove cache folder)
10. Run choco search vcredist140 again
11. Validate no warning is shown in console
12. Validate log file contains image
    

Non-Elevated tests

1. Create directory C:\Users\<USERNAME>\.chocolatey\http-cache and recreate folder C:\ProgramData\ChocolateyHttpCache
2. Run the command choco search vcredist140 —debug
3. Validate no warning is shown
4. Validate console output contains image
   
5. Delete Folder C:\Users\<USERNAME>\.chocolatey\http-cache
6. Replay steps 2-4
7. Replay again steps 2-4

Operating Systems Testing

• Windows Server 2022

Change Types Made

• Bug fix (non-breaking change).
• Feature / Enhancement (non-breaking change).
• Breaking change (fix or feature that could cause existing functionality to change).
• Documentation changes.
• PowerShell code changes.

Change Checklist

• Requires a change to the documentation.
• Documentation has been updated.
• Tests to cover my changes, have been added.
• All new and existing tests passed?
• PowerShell code changes: PowerShell v2 compatibility checked?

Related Issue

Fixes #3281

[gep13]

LGTM!

[gep13]

@AdmiringWorm this is a great addition! Thank you for getting this done!