GraphQL add commits endpoint

Added commits endpoint.
Changelog: added
Signed-off-by: Lucas Zampieri <lzampier@redhat.com>

app/graphql/types/merge_request_type.rb

@@ -189,6 +189,8 @@ module Types
           description: 'Indicates if the merge request has CI.'
     field :mergeable, GraphQL::Types::Boolean, null: false, method: :mergeable?, calls_gitaly: true,
           description: 'Indicates if the merge request is mergeable.'
+    field :commits, Types::CommitType.connection_type, null: true,
+          calls_gitaly: true, description: 'Merge request commits.'
     field :commits_without_merge_commits, Types::CommitType.connection_type, null: true,
           calls_gitaly: true, description: 'Merge request commits excluding merge commits.'
     field :security_auto_fix, GraphQL::Types::Boolean, null: true,
@@ -265,6 +267,10 @@ module Types
       AutoMergeService.new(object.project, current_user).available_strategies(object)
     end
 
+    def commits
+      object.commits.commits
+    end
+
     def commits_without_merge_commits
       object.commits.without_merge_commits
     end

doc/api/graphql/reference/index.md

@@ -11837,6 +11837,7 @@ Maven metadata.
 | <a id="mergerequestautomergestrategy"></a>`autoMergeStrategy` | [`String`](#string) | Selected auto merge strategy. |
 | <a id="mergerequestavailableautomergestrategies"></a>`availableAutoMergeStrategies` | [`[String!]`](#string) | Array of available auto merge strategies. |
 | <a id="mergerequestcommitcount"></a>`commitCount` | [`Int`](#int) | Number of commits in the merge request. |
+| <a id="mergerequestcommits"></a>`commits` | [`CommitConnection`](#commitconnection) | Merge request commits. (see [Connections](#connections)) |
 | <a id="mergerequestcommitswithoutmergecommits"></a>`commitsWithoutMergeCommits` | [`CommitConnection`](#commitconnection) | Merge request commits excluding merge commits. (see [Connections](#connections)) |
 | <a id="mergerequestconflicts"></a>`conflicts` | [`Boolean!`](#boolean) | Indicates if the merge request has conflicts. |
 | <a id="mergerequestcreatedat"></a>`createdAt` | [`Time!`](#time) | Timestamp of when the merge request was created. |

spec/graphql/types/merge_request_type_spec.rb

@@ -33,7 +33,7 @@ RSpec.describe GitlabSchema.types['MergeRequest'] do
       total_time_spent human_time_estimate human_total_time_spent reference author merged_at
       commit_count current_user_todos conflicts auto_merge_enabled approved_by source_branch_protected
       default_merge_commit_message_with_description squash_on_merge available_auto_merge_strategies
-      has_ci mergeable commits_without_merge_commits squash security_auto_fix default_squash_commit_message
+      has_ci mergeable commits commits_without_merge_commits squash security_auto_fix default_squash_commit_message
       auto_merge_strategy merge_user
     ]