Issue #SB-15822 feat: User preference data saving implementation

src/app/client/projects/desktop/src/app/modules/offline/components/onboarding/onboarding.component.ts

 import { IImpressionEventInput, IInteractEventEdata } from '@sunbird/telemetry';
 import { ToasterService } from '@sunbird/shared';
-import { Component, OnInit, Output, OnDestroy, Input, EventEmitter } from '@angular/core';
+import { Component } from '@angular/core';
 import { Router, ActivatedRoute } from '@angular/router';
-import { DOCUMENT } from '@angular/common';
 import { ResourceService } from '@sunbird/shared';
 import * as _ from 'lodash-es';
 import { OnboardingService } from './../../services';
@@ -12,8 +11,7 @@ import { OnboardingService } from './../../services';
   templateUrl: './onboarding.component.html',
   styleUrls: ['./onboarding.component.scss']
 })
-export class OnboardingComponent implements OnInit {
-
+export class OnboardingComponent {
   slide = 'location';
   telemetryImpressionData: IImpressionEventInput;
   telemetryInteractEdata: IInteractEventEdata;
@@ -22,9 +20,6 @@ export class OnboardingComponent implements OnInit {
     public onboardingService: OnboardingService) {
   }
 
-  ngOnInit() {
-  }
-
   handleLocationSaveEvent() {
     this.slide = 'contentPreference';
   }
@@ -34,7 +29,7 @@ export class OnboardingComponent implements OnInit {
   }
 
   setTelemetryData() {
-   return {
+    return {
       context: { env: 'onboarding' },
       edata: {
         type: 'view',

src/app/client/projects/desktop/src/app/modules/offline/services/onboarding/onboarding.service.ts

-import { map, catchError } from 'rxjs/operators';
 import { PublicDataService } from '@sunbird/core';
 import { ConfigService, ServerResponse } from '@sunbird/shared';
 import { Injectable, EventEmitter } from '@angular/core';
-import { throwError as observableThrowError, Observable } from 'rxjs';
+import { Observable } from 'rxjs';
 import * as _ from 'lodash-es';
+
 @Injectable({
   providedIn: 'root'
 })
+
 export class OnboardingService {
   onboardCompletion = new EventEmitter();
   userData;
@@ -23,12 +24,14 @@ export class OnboardingService {
     };
     return this.publicDataService.post(options);
   }
+
   getUser() {
     const options = {
       url: this.configService.urlConFig.URLS.OFFLINE.READ_USER
     };
     return this.publicDataService.get(options);
   }
+
   saveLocation(request) {
     const options = {
       url: this.configService.urlConFig.URLS.OFFLINE.LOCATION_SAVE,
@@ -36,6 +39,7 @@ export class OnboardingService {
     };
     return this.publicDataService.post(options);
   }
+
   saveUserPreference(request) {
     const options = {
       url: this.configService.urlConFig.URLS.OFFLINE.CREATE_USER,