Remove prefix from oncall rotations field

Update docs

doc/api/graphql/reference/gitlab_schema.graphql

@@ -11082,7 +11082,7 @@ type IncidentManagementOncallSchedule {
   """
   On-call rotations for the on-call schedule
   """
-  oncallRotations(
+  rotations(
     """
     Returns the elements in the list that come after the specified cursor.
     """

doc/api/graphql/reference/gitlab_schema.json

@@ -30365,7 +30365,7 @@
               "deprecationReason": null
             },
             {
-              "name": "oncallRotations",
+              "name": "rotations",
               "description": "On-call rotations for the on-call schedule",
               "args": [
                 {

doc/api/graphql/reference/index.md

@@ -1734,7 +1734,7 @@ Describes an incident management on-call schedule.
 | `description` | String | Description of the on-call schedule |
 | `iid` | ID! | Internal ID of the on-call schedule |
 | `name` | String! | Name of the on-call schedule |
-| `oncallRotations` | IncidentManagementOncallRotationConnection! | On-call rotations for the on-call schedule |
+| `rotations` | IncidentManagementOncallRotationConnection! | On-call rotations for the on-call schedule |
 | `timezone` | String! | Time zone of the on-call schedule |
 
 ### InstanceSecurityDashboard

ee/app/graphql/types/incident_management/oncall_rotation_type.rb

@@ -37,10 +37,6 @@ module Types
             ::Types::IncidentManagement::OncallParticipantType.connection_type,
             null: true,
             description: 'Participants of the on-call rotation'
-
-      def participants
-        object.oncall_participants
-      end
     end
   end
 end

ee/app/graphql/types/incident_management/oncall_schedule_type.rb

@@ -28,11 +28,10 @@ module Types
             null: false,
             description: 'Time zone of the on-call schedule'
 
-      field :oncall_rotations,
+      field :rotations,
             OncallRotationType.connection_type,
             null: false,
             description: 'On-call rotations for the on-call schedule'
-
     end
   end
 end

ee/spec/graphql/mutations/incident_management/oncall_rotation/create_spec.rb

@@ -87,7 +87,7 @@ RSpec.describe Mutations::IncidentManagement::OncallRotation::Create do
           end
 
           it 'raises an error' do
-            expect { resolve }.to raise_error(ActiveRecord::RecordInvalid, /Participant does not have access to the project/)
+            expect { resolve }.to raise_error(ActiveRecord::RecordInvalid, /User does not have access to the project/)
           end
         end
 

ee/spec/graphql/types/incident_management/oncall_schedule_type_spec.rb

@@ -13,7 +13,7 @@ RSpec.describe GitlabSchema.types['IncidentManagementOncallSchedule'] do
       name
       description
       timezone
-      oncall_rotations
+      rotations
     ]
 
     expect(described_class).to have_graphql_fields(*expected_fields)