[v8.1.x] Navbar: Add sanitize validation to urls (#41311)

* Navbar: Add sanitize validation to urls

* NavBar: Change help link from '#' to '/'

* global replace

* Fix tests

Co-authored-by: Alexandra Vargas <alexa1866@gmail.com>
Co-authored-by: Ashley Harrison <ashley.harrison@grafana.com>
Co-authored-by: Dan Cech <dcech@grafana.com>

pkg/api/index.go

@@ -344,7 +344,7 @@ func (hs *HTTPServer) getNavTree(c *models.ReqContext, hasEditPerm bool) ([]*dto
 		Text:         "Help",
 		SubTitle:     helpVersion,
 		Id:           "help",
-		Url:          "#",
+		Url:          "/",
 		Icon:         "question-circle",
 		HideFromMenu: true,
 		SortWeight:   dtos.WeightHelp,