Replace danger-ruby with danger-kotlin

[luongvo]

Why

We're using danger-ruby which requires setting up Ruby env for execution while mainly working with Android/Kotlin env.

android-templates/.github/workflows/review_pull_request.yml

Lines 61 to 82 in 3f4b9c3

	- name: Set up Ruby
	uses: ruby/setup-ruby@v1
	with:
	ruby-version: '2.7'
	- name: Cache gems
	uses: actions/cache@v2
	with:
	path: vendor/bundle
	key: ${{ runner.os }}-gems-${{ hashFiles('**/Gemfile.lock') }}
	restore-keys: |
	${{ runner.os }}-gems-
	- name: Install Bundle and check environment versions
	run: |
	echo 'Install Bundle'
	bundle config path vendor/bundle
	bundle install
	echo 'Check environment setup versions'
	ruby --version
	gem --version
	bundler --version

Using danger-kotlin would bring better language integration & workflow optimization.

Who Benefits?

Developers

[luongvo]

@ryan-conway Due to an unresolved issue, move this back to "Ice-box" 🤒