Remove deprecated CI lint page

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/controllers/ci/lints_controller.rb

-# frozen_string_literal: true
-
-module Ci
-  class LintsController < ::ApplicationController
-    before_action :authenticate_user!
-
-    def show
-    end
-  end
-end

app/views/ci/lints/show.html.haml

-.row.empty-state
-  .col-12
-    .svg-content
-      = image_tag 'illustrations/feature_moved.svg'
-  .col-12
-    .text-content.text-center
-      %h4= _("GitLab CI Linter has been moved")
-      %p
-        = _("To validate your GitLab CI configurations, go to 'CI/CD → Pipelines' inside your project, and click on the 'CI Lint' button.")

changelogs/unreleased/remove-deprecated-lint-page.yml

+---
+title: Remove deprecated /ci/lint page
+merge_request: 28562
+author:
+type: removed

config/routes.rb

@@ -19,7 +19,6 @@ Rails.application.routes.draw do
 
   draw :sherlock
   draw :development
-  draw :ci
 
   use_doorkeeper do
     controllers applications: 'oauth/applications',

config/routes/ci.rb

-namespace :ci do
-  resource :lint, only: :show
-
-  root to: redirect('')
-end

doc/user/reserved_names.md

@@ -55,7 +55,6 @@ Currently the following names are reserved as top level groups:
 - `apple-touch-icon.png`
 - `assets`
 - `autocomplete`
-- `ci`
 - `dashboard`
 - `deploy.html`
 - `explore`

lib/gitlab/path_regex.rb

@@ -28,7 +28,6 @@ module Gitlab
       apple-touch-icon.png
       assets
       autocomplete
-      ci
       dashboard
       deploy.html
       explore

locale/gitlab.pot

@@ -9623,9 +9623,6 @@ msgstr ""
 msgid "GitLab / Unsubscribe"
 msgstr ""
 
-msgid "GitLab CI Linter has been moved"
-msgstr ""
-
 msgid "GitLab Enterprise Edition %{plan}"
 msgstr ""
 
@@ -21192,9 +21189,6 @@ msgstr ""
 msgid "To this GitLab instance"
 msgstr ""
 
-msgid "To validate your GitLab CI configurations, go to 'CI/CD → Pipelines' inside your project, and click on the 'CI Lint' button."
-msgstr ""
-
 msgid "To view the roadmap, add a start or due date to one of your epics in this group or its subgroups. In the months view, only epics in the past month, current month, and next 5 months are shown."
 msgstr ""