[CST-15592] add accessibility tests for following pages:

Metadata Import
Batch Import
Processes Overview
New Process
Quality Assurance Sources

src/app/notifications/qa/source/quality-assurance-source.component.html

@@ -7,7 +7,7 @@
     </div>
     <div class="row">
       <div class="col-12">
-        <h4 class="border-bottom pb-2">{{'quality-assurance.source'| translate}}</h4>
+        <h3 class="h4 border-bottom pb-2">{{'quality-assurance.source'| translate}}</h3>
 
         <ds-loading class="container" *ngIf="(isSourceLoading() | async)" message="{{'quality-assurance.loading' | translate}}"></ds-loading>
         <ds-pagination *ngIf="(isSourceLoading() | async) !== true"

src/app/process-page/overview/table/process-overview-table.component.html

@@ -44,7 +44,6 @@
               <td>{{tableEntry.info}}</td>
               <td>
                 <button [attr.aria-label]="'process.overview.delete-process' | translate"
-                        aria-hidden="true"
                         (click)="processBulkDeleteService.toggleDelete(tableEntry.process.processId)"
                         class="btn btn-outline-danger">
                   <i class="fas fa-trash"></i>