chore: Prepare for GitHub Action v3.0.0 release (#85)

feat!: `fortify/github-action/setup`: Now uses `@fortify/setup` NPM component instead of GitHub-specific implementation, resulting in changes to supported action inputs and environment variables

feat!: `fortify/github-action`: Now uses `fcli action run ci` instead of GitHub-specific scripts, resulting in changes to supported action inputs and environment variables

feat!: `fortify/github-action/*`: All sub-actions except for the `setup` action have been removed; use the top-level `fortify/github-action` to run a full AST scan pipeline, or use the `setup` action in combination with `fcli` commands or actions to implement custom workflows

Author: rsenden