feat(dees-contextmenu,dees-appui-tabs,test): Prevent double-destruction of context menus, await window layer teardown, update destroyAll behavior, remove tabs content slot, and adjust tests

ts_web/elements/00group-appui/dees-appui-tabs/dees-appui-tabs.ts

@@ -198,19 +198,12 @@ export class DeesAppuiTabs extends DeesElement {
         z-index: 1;
         box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
       }
-
-      .content {
-        padding: 32px 24px;
-      }
     `,
   ];
 
   public render(): TemplateResult {
     return html`
       ${this.renderTabsWrapper()}
-      <div class="content">
-        <slot></slot>
-      </div>
     `;
   }