Warn against Chef::Util::FileEdit usage

[dafyddcrosby]

See chef/chef#7043

What category of cop is this?:

Please try to select as few as possible.

• Chef/Deprecations - A cop that alerts on a deprecation in the Chef Infra Client
• Chef/Correctness - A cop that alerts when incorrect coding behavior is being used
• Chef/Sharing - A cop that alerts to missing functionality necessary for sharing cookbooks with others
• Chef/Style - A cop that alerts to a style best practice
• Chef/Modernize - A cop that alerts when a cookbook can be simplified or modernized with new functionality
• Chef/Effortless - A cop that alerts on code that must be resolved to move to the Effortless pattern
• Chef/RedundantCode - A cop that detects redundant code regardless of Chef Infra release
• Chef/Security - A cop that detects potential security issues like secrets in your code
• InSpec/Deprecations - A cop that alerts on a deprecation in the Chef InSpec

Describe the new cop:

What it would trigger on:

What it would autocorrect to if applicable

Can We Help You Implement This?:

I can handle it fine, putting here so I don't forget about it after the holidays.