feat: use create access token api endpoint instead of login mutation

packages/backend/src/graphql/schema.graphql

@@ -18,7 +18,6 @@ type Mutation {
   duplicateFlow(input: DuplicateFlowInput): Flow
   executeFlow(input: ExecuteFlowInput): executeFlowType
   generateAuthUrl(input: GenerateAuthUrlInput): AuthLink
-  login(input: LoginInput): Auth
   registerUser(input: RegisterUserInput): User
   resetConnection(input: ResetConnectionInput): Connection
   updateAppAuthClient(input: UpdateAppAuthClientInput): AppAuthClient
@@ -152,11 +151,6 @@ enum ArgumentEnumType {
   string
 }
 
-type Auth {
-  user: User
-  token: String
-}
-
 type AuthenticationStep {
   type: String
   name: String
@@ -403,11 +397,6 @@ input UpdateCurrentUserInput {
   fullName: String
 }
 
-input LoginInput {
-  email: String!
-  password: String!
-}
-
 input PermissionInput {
   action: String!
   subject: String!