fix(a11y): remove presentational wrappers from edit-metadata table to satisfy aria-required-children

Author: milanmajchrak

src/app/dso-shared/dso-edit-metadata/dso-edit-metadata-field-values/dso-edit-metadata-field-values.component.html

@@ -1,6 +1,6 @@
 <div class="flex-grow-1 ds-drop-list h-100" [class.disabled]="(draggingMdField$ | async) && (draggingMdField$ | async) !== mdField" cdkDropList (cdkDropListDropped)="drop($event)" role="table">
-  <ds-dso-edit-metadata-value-headers role="presentation" [dsoType]="dsoType"></ds-dso-edit-metadata-value-headers>
-  <ds-dso-edit-metadata-value *ngFor="let mdValue of form.fields[mdField]; let idx = index" role="presentation"
+  <ds-dso-edit-metadata-value-headers [dsoType]="dsoType"></ds-dso-edit-metadata-value-headers>
+  <ds-dso-edit-metadata-value *ngFor="let mdValue of form.fields[mdField]; let idx = index"
                               [dso]="dso"
                               [mdValue]="mdValue"
                               [mdField]="mdField"

src/app/dso-shared/dso-edit-metadata/dso-edit-metadata.component.html

@@ -38,7 +38,7 @@
       </div>
       <div class="flex-grow-1 ds-drop-list" role="cell">
         <div role="table">
-          <ds-dso-edit-metadata-value-headers role="presentation" [dsoType]="dsoType"></ds-dso-edit-metadata-value-headers>
+          <ds-dso-edit-metadata-value-headers [dsoType]="dsoType"></ds-dso-edit-metadata-value-headers>
           <ds-dso-edit-metadata-value [dso]="dso"
                                       [mdValue]="form.newValue"
                                       [dsoType]="dsoType"