Boilerplate windows support

[denis256]

Description

Included changes:

• Fixed handling of paths in Windows
• Added support for Windows CICD
• Fixed base tests for Windows environment
• Changed "kebab test" to generate files with placeholder instead of saving files in git since it breaks repo clone in Windows
• Added skipping for some tests that relay on OS native commands
• Updated mime type detection to use only read data

Before this change:

With the change from this PR:

TODOs

Read the Gruntwork contribution guidelines.

• Update the docs.
• Run the relevant tests successfully, including pre-commit checks.
• Ensure any 3rd party code adheres with our license policy or delete this line if its not applicable.
• Include release notes. If this PR is backward incompatible, include a migration guide.

Release Notes (draft)

Added / Removed / Updated [X].

Updated boilerplate template path identification in Windows.

Migration Guide

[brikis98]

This is the announcement blog post I was talking about: https://blog.gruntwork.io/introducing-boilerplate-6d796444ecf6. It contains links to the boilerplate repo, but I made the links go to a specific commit, so if you make changes to the example code, it shouldn't break anything. We really do need the dynamic name in the test file (hence the {{ xxx }} in the path), but fixing all the issues on Windows is pretty important, so perhaps for now, you can update that example to dynamically generate the file, so we can get this merged soon, and we can come back to a more long-term fix in the future?

[denis256]

Fixed tests for Windows and updated approach with variables in file names - in git are stored "generic" names and in tests for "unix" platform files are renamed with variables in the name

https://github.com/gruntwork-io/boilerplate/pull/164/files#diff-029441898e3ff4247efb42bd1056bce6b2b51b6a8950731f9b94c71ff93ae364R78

[brikis98]

LGTM! Please merge and release.