feat(server): support importing users with password (#11978)

<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit

- **New Features**
  - Added support for an optional password field when creating a new user via the user creation form or API.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/common/graphql/src/schema.ts

@@ -444,6 +444,7 @@ export interface CreateCopilotPromptInput {
 export interface CreateUserInput {
   email: Scalars['String']['input'];
   name?: InputMaybe<Scalars['String']['input']>;
+  password?: InputMaybe<Scalars['String']['input']>;
 }
 
 export interface CredentialsRequirementType {