fix: Removing unnecessary user info returned from the backend (#4138)

### What changes were proposed in this PR?
Currently the endpoint `/api/workflow/owner_user/?wid=X` returns all the
information about the user, including name, email, etc. But the frontend
only needs the name. This PR limits the information returned from the
backend to the user name only.

The main changes are as follow:

1. Change the endpoint name from `/api/workflow/owner_user` to
`/api/workflow/owner_name`
2. Change the SQL query to only return name as plain text.
3. Change related uses of the endpoint in the frontend to match the new
signature.
4. Added a new `WorkflowResourceDashboardUserSpec` to test this endpoint
and support future testing of related endpoints.

### Any related issues, documentation, discussions?
No


### How was this PR tested?
Tests:
<img width="1778" height="429" alt="image"
src="https://github.com/user-attachments/assets/81b91d73-7396-4d97-a53f-80d4ed5ca724"
/>


Manually tested:
<img width="1348" height="658" alt="image"
src="https://github.com/user-attachments/assets/1aeba8b4-343c-407f-b1ef-ffc5b4afee1a"
/>



### Was this PR authored or co-authored using generative AI tooling?
No

Author: carloea2

amber/src/main/scala/org/apache/texera/web/resource/dashboard/user/workflow/WorkflowResource.scala

@@ -712,23 +712,16 @@ class WorkflowResource extends LazyLogging {
   }
 
   @GET
-  @Path("/owner_user")
-  def getOwnerUser(@QueryParam("wid") wid: Integer): User = {
+  @Produces(Array(MediaType.TEXT_PLAIN))
+  @Path("/owner_name")
+  def getOwnerName(@QueryParam("wid") wid: Integer): String = {
     context
-      .select(
-        USER.UID,
-        USER.NAME,
-        USER.EMAIL,
-        USER.PASSWORD,
-        USER.GOOGLE_ID,
-        USER.ROLE,
-        USER.GOOGLE_AVATAR
-      )
-      .from(WORKFLOW_OF_USER)
-      .join(USER)
-      .on(WORKFLOW_OF_USER.UID.eq(USER.UID))
+      .select(USER.NAME)
+      .from(USER)
+      .join(WORKFLOW_OF_USER)
+      .on(USER.UID.eq(WORKFLOW_OF_USER.UID))
       .where(WORKFLOW_OF_USER.WID.eq(wid))
-      .fetchOneInto(classOf[User])
+      .fetchOneInto(classOf[String])
   }
 
   @GET

amber/src/test/scala/org/apache/texera/web/resource/dashboard/file/WorkflowResourceSpec.scala

@@ -300,6 +300,23 @@ class WorkflowResourceSpec
     )
   }
 
+  "WorkflowResource /owner_name" should "return owner name as plain text" in {
+    workflowResource.persistWorkflow(testWorkflow1, sessionUser1)
+
+    val workflows = workflowResource.retrieveWorkflowsBySessionUser(sessionUser1)
+    assert(workflows.nonEmpty)
+
+    val wid =
+      workflows
+        .find(_.workflow.getName == testWorkflow1.getName)
+        .map(_.workflow.getWid)
+        .getOrElse(workflows.head.workflow.getWid)
+
+    val ownerName = workflowResource.getOwnerName(wid)
+
+    assert(ownerName == testUser.getName)
+  }
+
   "/search API " should "be able to search for workflows in different columns in Workflow table" in {
     // testWorkflow1: {name: test_name, descrption: test_description, content: test_content}
     // search "test_name" or "test_description" or "test_content" should return testWorkflow1

frontend/src/app/common/service/workflow-persist/workflow-persist.service.ts

@@ -41,7 +41,7 @@ export const WORKFLOW_UPDATENAME_URL = WORKFLOW_BASE_URL + "/update/name";
 export const WORKFLOW_UPDATEDESCRIPTION_URL = WORKFLOW_BASE_URL + "/update/description";
 export const WORKFLOW_OWNER_URL = WORKFLOW_BASE_URL + "/user-workflow-owners";
 export const WORKFLOW_ID_URL = WORKFLOW_BASE_URL + "/user-workflow-ids";
-export const WORKFLOW_OWNER_USER = WORKFLOW_BASE_URL + "/owner_user";
+export const WORKFLOW_OWNER_NAME = WORKFLOW_BASE_URL + "/owner_name";
 export const WORKFLOW_NAME = WORKFLOW_BASE_URL + "/workflow_name";
 export const WORKFLOW_PUBLIC_WORKFLOW = WORKFLOW_BASE_URL + "/publicised";
 export const WORKFLOW_DESCRIPTION = WORKFLOW_BASE_URL + "/workflow_description";
@@ -238,13 +238,12 @@ export class WorkflowPersistService {
   }
 
   /**
-   * retrieve the complete information of the owner corresponding to the wid
-   * can be used without logging in
-   * @param wid
+   * Retrieve workflow owner name (no login required).
+   * @param wid workflow id
    */
-  public getOwnerUser(wid: number): Observable<User> {
+  public getOwnerName(wid: number): Observable<string> {
     const params = new HttpParams().set("wid", wid);
-    return this.http.get<User>(`${AppSettings.getApiEndpoint()}/${WORKFLOW_OWNER_USER}`, { params });
+    return this.http.get(`${AppSettings.getApiEndpoint()}/${WORKFLOW_OWNER_NAME}`, { params, responseType: "text" });
   }
 
   /**

frontend/src/app/hub/component/workflow/detail/hub-workflow-detail.component.ts

@@ -98,10 +98,10 @@ export class HubWorkflowDetailComponent implements AfterViewInit, OnDestroy, OnI
         this.viewCount = count;
       });
     this.workflowPersistService
-      .getOwnerUser(this.wid)
+      .getOwnerName(this.wid)
       .pipe(untilDestroyed(this))
-      .subscribe(owner => {
-        this.ownerName = owner.name;
+      .subscribe(ownerName => {
+        this.ownerName = ownerName;
       });
     this.workflowPersistService
       .getWorkflowName(this.wid)