Merge branch 'fix/remove-deprecated-ci-helper' into 'master'

Remove deprecated CI badge helper

Closes #13446

See merge request !3977

app/helpers/ci_badge_helper.rb

-module CiBadgeHelper
-  def markdown_badge_code(project, ref)
-    url = status_ci_project_url(project, ref: ref, format: 'png')
-    link = namespace_project_commits_path(project.namespace, project, ref)
-    "[![build status](#{url})](#{link})"
-  end
-
-  def html_badge_code(project, ref)
-    url = status_ci_project_url(project, ref: ref, format: 'png')
-    link = namespace_project_commits_path(project.namespace, project, ref)
-    "<a href='#{link}'><img src='#{url}' /></a>"
-  end
-end