Revert "Remove commit sha from rails injection"

This reverts commit e8dcec112452e0c3c8ca1a9520e6101cd98fe2a5
to include the rails injection again. This will be removed
in a follow-up MR.

This also fixes some linter complaints.

app/helpers/ci/pipeline_editor_helper.rb

@@ -16,6 +16,7 @@ module Ci
         "ci-config-path": project.ci_config_path_or_default,
         "ci-examples-help-page-path" => help_page_path('ci/examples/index'),
         "ci-help-page-path" => help_page_path('ci/index'),
+        "commit-sha" => commit_sha,
         "default-branch" => project.default_branch_or_main,
         "empty-state-illustration-path" => image_path('illustrations/empty-state/empty-dag-md.svg'),
         "initial-branch-name" => initial_branch,

spec/frontend/pipeline_editor/components/commit/commit_section_spec.js

-import waitForPromises from 'helpers/wait_for_promises';
 import { GlFormTextarea, GlFormInput, GlLoadingIcon } from '@gitlab/ui';
 import { mount } from '@vue/test-utils';
+import waitForPromises from 'helpers/wait_for_promises';
 import { objectToQuery, redirectTo } from '~/lib/utils/url_utility';
 import CommitForm from '~/pipeline_editor/components/commit/commit_form.vue';
 import CommitSection from '~/pipeline_editor/components/commit/commit_section.vue';

spec/helpers/ci/pipeline_editor_helper_spec.rb

@@ -42,6 +42,7 @@ RSpec.describe Ci::PipelineEditorHelper do
           "ci-config-path": project.ci_config_path_or_default,
           "ci-examples-help-page-path" => help_page_path('ci/examples/index'),
           "ci-help-page-path" => help_page_path('ci/index'),
+          "commit-sha" => project.commit.sha,
           "default-branch" => project.default_branch_or_main,
           "empty-state-illustration-path" => 'foo',
           "initial-branch-name" => nil,
@@ -68,6 +69,7 @@ RSpec.describe Ci::PipelineEditorHelper do
           "ci-config-path": project.ci_config_path_or_default,
           "ci-examples-help-page-path" => help_page_path('ci/examples/index'),
           "ci-help-page-path" => help_page_path('ci/index'),
+          "commit-sha" => '',
           "default-branch" => project.default_branch_or_main,
           "empty-state-illustration-path" => 'foo',
           "initial-branch-name" => nil,
@@ -95,7 +97,10 @@ RSpec.describe Ci::PipelineEditorHelper do
       end
 
       it 'returns correct values' do
+        latest_feature_sha = project.repository.commit('feature').sha
+
         expect(pipeline_editor_data['initial-branch-name']).to eq('feature')
+        expect(pipeline_editor_data['commit-sha']).to eq(latest_feature_sha)
       end
     end
   end