Remove specs for legacy build image service

spec/services/ci/image_for_build_service_spec.rb

-require 'spec_helper'
-
-module Ci
-  describe ImageForBuildService, services: true do
-    let(:service) { ImageForBuildService.new }
-    let(:project) { FactoryGirl.create(:empty_project) }
-    let(:commit_sha) { '01234567890123456789' }
-    let(:pipeline) { project.ensure_pipeline('master', commit_sha) }
-    let(:build) { FactoryGirl.create(:ci_build, pipeline: pipeline) }
-
-    describe '#execute' do
-      before { build }
-
-      context 'branch name' do
-        before { allow(project).to receive(:commit).and_return(OpenStruct.new(sha: commit_sha)) }
-        before { build.run! }
-        let(:image) { service.execute(project, ref: 'master') }
-
-        it { expect(image).to be_kind_of(OpenStruct) }
-        it { expect(image.path.to_s).to include('public/ci/build-running.svg') }
-        it { expect(image.name).to eq('build-running.svg') }
-      end
-
-      context 'unknown branch name' do
-        let(:image) { service.execute(project, ref: 'feature') }
-
-        it { expect(image).to be_kind_of(OpenStruct) }
-        it { expect(image.path.to_s).to include('public/ci/build-unknown.svg') }
-        it { expect(image.name).to eq('build-unknown.svg') }
-      end
-
-      context 'commit sha' do
-        before { build.run! }
-        let(:image) { service.execute(project, sha: build.sha) }
-
-        it { expect(image).to be_kind_of(OpenStruct) }
-        it { expect(image.path.to_s).to include('public/ci/build-running.svg') }
-        it { expect(image.name).to eq('build-running.svg') }
-      end
-
-      context 'unknown commit sha' do
-        let(:image) { service.execute(project, sha: '0000000') }
-
-        it { expect(image).to be_kind_of(OpenStruct) }
-        it { expect(image.path.to_s).to include('public/ci/build-unknown.svg') }
-        it { expect(image.name).to eq('build-unknown.svg') }
-      end
-    end
-  end
-end