Add `--disable-dependency-prompt` flag

[jasonyoung-pearl]

Description

Adds a --disable-dependency-prompt CLI flag, which disables the confirmation prompt for dependency includes.

This is useful when you want to keep interactive mode enabled for user variable input, but don't want to surface the internal template dependencies to the user (or any situation in which you always want to respond y to each include).

Open to alternative names to the flag.

TODOs

Read the Gruntwork contribution guidelines.

• [x] Update the docs.
• [x] Run the relevant tests successfully, including pre-commit checks.
• [x] Include release notes. If this PR is backward incompatible, include a migration guide.

Release Notes (draft)

Added: --disable-dependency-prompt optional CLI flag, which disables the confirmation prompt for dependency includes.

Migration Guide

n/a

[josh-padnick]

@ZachGoldberg @denis256 Could we get a review on this?