Manual actions are accessible from:
- Pipelines
- Builds
- Environments
- Deployments

This reverts commit 3e991230.

# Conflicts:
#	app/models/project.rb

- Remove unused Gitlab::Application.routes.url_helpers from Ci::Build
- Remove too much logic from a view, use Ci::Commit.matrix_builds
- Use ci_status_with_icon
- Don't describe symbols

- Remove all view related methods from Ci::Build and CommitStatus
- Remove unused Ci::Commit and Ci::Build methods
- Use polymorphism to render different types of CommitStatus