Expose issue ids via GraphQL

- update docs

app/graphql/types/issue_type.rb

@@ -12,6 +12,8 @@ module Types
 
     present_using IssuePresenter
 
+    field :id, GraphQL::ID_TYPE, null: false,
+          description: "ID of the issue"
     field :iid, GraphQL::ID_TYPE, null: false,
           description: "Internal ID of the issue"
     field :title, GraphQL::STRING_TYPE, null: false,

changelogs/unreleased/218040-cablett-graphql-issue-id.yml

+---
+title: Expose issue ID via GraphQL
+merge_request: 36412
+author:
+type: changed

doc/api/graphql/reference/gitlab_schema.graphql

@@ -5747,6 +5747,11 @@ type Issue implements Noteable {
   """
   healthStatus: HealthStatus
 
+  """
+  ID of the issue
+  """
+  id: ID!
+
   """
   Internal ID of the issue
   """

doc/api/graphql/reference/gitlab_schema.json

@@ -15821,6 +15821,24 @@
               "isDeprecated": false,
               "deprecationReason": null
             },
+            {
+              "name": "id",
+              "description": "ID of the issue",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "NON_NULL",
+                "name": null,
+                "ofType": {
+                  "kind": "SCALAR",
+                  "name": "ID",
+                  "ofType": null
+                }
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
             {
               "name": "iid",
               "description": "Internal ID of the issue",

doc/api/graphql/reference/index.md

@@ -860,6 +860,7 @@ Represents a Group Member
 | `dueDate` | Time | Due date of the issue |
 | `epic` | Epic | Epic to which this issue belongs |
 | `healthStatus` | HealthStatus | Current health status. Returns null if `save_issuable_health_status` feature flag is disabled. |
+| `id` | ID! | ID of the issue |
 | `iid` | ID! | Internal ID of the issue |
 | `iteration` | Iteration | Iteration of the issue |
 | `milestone` | Milestone | Milestone of the issue |

spec/graphql/types/issue_type_spec.rb

@@ -12,7 +12,7 @@ RSpec.describe GitlabSchema.types['Issue'] do
   specify { expect(described_class.interfaces).to include(Types::Notes::NoteableType) }
 
   it 'has specific fields' do
-    fields = %i[iid title description state reference author assignees participants labels milestone due_date
+    fields = %i[id iid title description state reference author assignees participants labels milestone due_date
                 confidential discussion_locked upvotes downvotes user_notes_count web_path web_url relative_position
                 subscribed time_estimate total_time_spent closed_at created_at updated_at task_completion_status
                 designs design_collection]