Cherry picked Prevent Section URL Retention fix

Author: nielslyngsoe

src/Umbraco.Web.UI.Client/src/apps/backoffice/components/backoffice-header-sections.element.ts

@@ -78,8 +78,9 @@ export class UmbBackofficeHeaderSectionsElement extends UmbLitElement {
 
 		const clickedSectionAlias = manifest.alias;
 
-		// If the clicked section is the same as the current section, we just load the original section path to load the section root
-		if (this._currentSectionAlias === clickedSectionAlias) {
+		// If preventUrlRetention is set to true then go to the section root.
+		// Or if the clicked section is the current active one, then navigate to the section root
+		if (manifest?.meta.preventUrlRetention === true || this._currentSectionAlias === clickedSectionAlias) {
 			const sectionPath = this.#getSectionPath(manifest);
 			history.pushState(null, '', sectionPath);
 			return;

src/Umbraco.Web.UI.Client/src/packages/core/section/extensions/section.extension.ts

@@ -12,4 +12,5 @@ export interface ManifestSection
 export interface MetaSection {
 	label: string;
 	pathname: string;
+	preventUrlRetention?: boolean;
 }