Add GQL API for deleteUser (#1443)

Summary: Previous changes added deleteUser to the profile and API gRPC
services. This PR adds it to the graphql layer.

Relevant Issues: #655

Type of change: /kind feature

Test Plan: Unit tests

Changelog Message:
```release-note
Add API to delete user in GQL and gRPC. If the user being deleted is the only user in the org, the org will also be deleted.
```

---------

Signed-off-by: Michelle Nguyen <michellenguyen@pixielabs.ai>

Author: aimichelle

src/cloud/api/controllers/schema/03_auth_schema.graphql

@@ -44,6 +44,7 @@ extend type Mutation {
   DeleteAPIKey(id: ID!): Boolean!
   UpdateUserSettings(settings: EditableUserSettings!): UserSettings!
   SetUserAttributes(attributes: EditableUserAttributes!): UserAttributes!
+  DeleteUser: Boolean!
   InviteUser(email: String!, firstName: String!, lastName: String!): UserInvite!
   UpdateUserPermissions(userID: ID!, userPermissions: EditableUserPermissions!): UserInfo!
   CreateOrg(orgName: String!): ID!

src/cloud/api/controllers/schema/complete/bindata.gen.go

@@ -241,3 +241,23 @@ func (q *QueryResolver) SetUserAttributes(ctx context.Context, args *setUserAttr
 
 	return resp, nil
 }
+
+// DeleteUser deletes the user with the current credentials.
+func (q *QueryResolver) DeleteUser(ctx context.Context) (bool, error) {
+	sCtx, err := authcontext.FromContext(ctx)
+	if err != nil {
+		return false, err
+	}
+
+	id := sCtx.Claims.GetUserClaims().UserID
+	req := &cloudpb.DeleteUserRequest{
+		ID: utils.ProtoFromUUIDStrOrNil(id),
+	}
+
+	_, err = q.Env.UserServer.DeleteUser(ctx, req)
+	if err != nil {
+		return false, rpcErrorHelper(err)
+	}
+
+	return true, nil
+}

src/cloud/api/controllers/schema/noauth/bindata.gen.go

@@ -420,3 +420,33 @@ func TestUserSettingsResolver_SetUserAttributes(t *testing.T) {
 		})
 	}
 }
+
+func TestUserSettingsResolver_DeleteUser(t *testing.T) {
+	t.Run("deletion succeeds", func(t *testing.T) {
+		gqlEnv, mockClients, cleanup := gqltestutils.CreateTestGraphQLEnv(t)
+		defer cleanup()
+		ctx := CreateTestContext()
+
+		mockClients.MockUser.EXPECT().DeleteUser(gomock.Any(), &cloudpb.DeleteUserRequest{
+			ID: utils.ProtoFromUUIDStrOrNil("6ba7b810-9dad-11d1-80b4-00c04fd430c9"),
+		}).Return(&cloudpb.DeleteUserResponse{}, nil)
+
+		gqlSchema := LoadSchema(gqlEnv)
+		gqltesting.RunTests(t, []*gqltesting.Test{
+			{
+				Schema:  gqlSchema,
+				Context: ctx,
+				Query: `
+						mutation {
+							DeleteUser()
+						}
+					`,
+				ExpectedResult: `
+						{
+							"DeleteUser": true
+						}
+					`,
+			},
+		})
+	})
+}

src/cloud/api/controllers/user_resolver.go

@@ -57,6 +57,7 @@ export interface GQLMutation {
   DeleteAPIKey: boolean;
   UpdateUserSettings: GQLUserSettings;
   SetUserAttributes: GQLUserAttributes;
+  DeleteUser: boolean;
   InviteUser: GQLUserInvite;
   UpdateUserPermissions: GQLUserInfo;
   CreateOrg: string;
@@ -640,6 +641,7 @@ export interface GQLMutationTypeResolver<TParent = any> {
   DeleteAPIKey?: MutationToDeleteAPIKeyResolver<TParent>;
   UpdateUserSettings?: MutationToUpdateUserSettingsResolver<TParent>;
   SetUserAttributes?: MutationToSetUserAttributesResolver<TParent>;
+  DeleteUser?: MutationToDeleteUserResolver<TParent>;
   InviteUser?: MutationToInviteUserResolver<TParent>;
   UpdateUserPermissions?: MutationToUpdateUserPermissionsResolver<TParent>;
   CreateOrg?: MutationToCreateOrgResolver<TParent>;
@@ -697,6 +699,10 @@ export interface MutationToSetUserAttributesResolver<TParent = any, TResult = an
   (parent: TParent, args: MutationToSetUserAttributesArgs, context: any, info: GraphQLResolveInfo): TResult;
 }
 
+export interface MutationToDeleteUserResolver<TParent = any, TResult = any> {
+  (parent: TParent, args: {}, context: any, info: GraphQLResolveInfo): TResult;
+}
+
 export interface MutationToInviteUserArgs {
   email: string;
   firstName: string;