Define remove_label quick action as alias of unlabel

Define a new quick action: `remove_label` which is an alias
of `unlabel`.

changelogs/unreleased/38022-add-remove_label-quick-action-more-intuitive-than-unlabel.yml

+---
+title: Define remove_label quick action as alias of unlabel
+merge_request: 24962
+author: Jacopo Beschi @jacopo-beschi
+type: added

doc/user/project/quick_actions.md

@@ -42,7 +42,7 @@ The following quick actions are applicable to descriptions, discussions and thre
 | `/remove_milestone`                   | ✓     | ✓             |      | Remove milestone |
 | `/label ~label1 ~label2`              | ✓     | ✓             | ✓    | Add label(s). Label names can also start without `~` but mixed syntax is not supported |
 | `/relabel ~label1 ~label2`            | ✓     | ✓             | ✓    | Replace existing label(s) with those specified |
-| `/unlabel ~label1 ~label2`            | ✓     | ✓             | ✓    | Remove all or specific label(s) |
+| `/unlabel ~label1 ~label2` or `/remove_label ~label1 ~label2` | ✓     | ✓             | ✓    | Remove all or specific label(s) |
 | `/copy_metadata <#issue>`             | ✓     | ✓             |      | Copy labels and milestone from another issue in the project |
 | `/copy_metadata <!merge_request>`     | ✓     | ✓             |      | Copy labels and milestone from another merge request in the project |
 | `/estimate <<W>w <DD>d <hh>h <mm>m>`  | ✓     | ✓             |      | Set time estimate. For example, `/estimate 1w 3d 2h 14m` |

lib/gitlab/quick_actions/issuable_actions.rb

@@ -109,7 +109,7 @@ module Gitlab
             quick_action_target.labels.any? &&
             current_user.can?(:"admin_#{quick_action_target.to_ability_name}", parent)
         end
-        command :unlabel do |labels_param = nil|
+        command :unlabel, :remove_label do |labels_param = nil|
           if labels_param.present?
             labels = find_labels(labels_param)
             label_ids = labels.map(&:id)

spec/support/shared_examples/quick_actions/issuable/issuable_quick_actions_shared_examples.rb

@@ -18,6 +18,16 @@ RSpec.shared_examples 'issuable quick actions' do
     end
   end
 
+  let(:unlabel_expectation) do
+    ->(noteable, can_use_quick_action) {
+      if can_use_quick_action
+        expect(noteable.labels).to be_empty
+      else
+        expect(noteable.labels).not_to be_empty
+      end
+    }
+  end
+
   # Quick actions shared by issues and merge requests
   let(:issuable_quick_actions) do
     [
@@ -136,13 +146,11 @@ RSpec.shared_examples 'issuable quick actions' do
       ),
       QuickAction.new(
         action_text: "/unlabel",
-        expectation: ->(noteable, can_use_quick_action) {
-          if can_use_quick_action
-            expect(noteable.labels).to be_empty
-          else
-            expect(noteable.labels).not_to be_empty
-          end
-        }
+        expectation: unlabel_expectation
+      ),
+      QuickAction.new(
+        action_text: "/remove_label",
+        expectation: unlabel_expectation
       ),
       QuickAction.new(
         action_text: "/award :100:",