Support navbar tracking

- Add tracking attributes to templates

app/views/layouts/_search.html.haml

@@ -2,7 +2,7 @@
   - group_data_attrs = { group_path: j(@group.path), name: @group.name, issues_path: issues_group_path(j(@group.path)), mr_path: merge_requests_group_path(j(@group.path)) }
 - if @project && @project.persisted?
   - project_data_attrs = { project_path: j(@project.path), name: j(@project.name), issues_path: project_issues_path(@project), mr_path: project_merge_requests_path(@project), issues_disabled: !@project.issues_enabled? }
-.search.search-form
+.search.search-form{ data: { track_label: "navbar_search", track_event: "activate_form_input" } }
   = form_tag search_path, method: :get, class: 'form-inline' do |f|
     .search-input-container
       .search-input-wrap

app/views/layouts/header/_default.html.haml

@@ -60,7 +60,7 @@
             .dropdown-menu.dropdown-menu-right
               = render 'layouts/header/help_dropdown'
           - if header_link?(:user_dropdown)
-            %li.nav-item.header-user.dropdown
+            %li.nav-item.header-user.dropdown{ data: { track_label: "profile_dropdown", track_event: "click_dropdown" } }
               = link_to current_user, class: user_dropdown_class, data: { toggle: "dropdown" } do
                 = image_tag avatar_icon_for_user(current_user, 23), width: 23, height: 23, class: "header-user-avatar qa-user-avatar"
                 = sprite_icon('angle-down', css_class: 'caret-down')

app/views/layouts/header/_new_dropdown.haml

-%li.header-new.dropdown
+%li.header-new.dropdown{ data: { track_label: "new_dropdown", track_event: "click_dropdown"  } }
   = link_to new_project_path, class: "header-new-dropdown-toggle has-tooltip qa-new-menu-toggle", title: _("New..."), ref: 'tooltip', aria: { label: _("New...") }, data: { toggle: 'dropdown', placement: 'bottom', container: 'body', display: 'static' } do
     = sprite_icon('plus-square', size: 16)
     = sprite_icon('angle-down', css_class: 'caret-down')

app/views/layouts/nav/_dashboard.html.haml

@@ -2,7 +2,7 @@
 -# https://gitlab.com/gitlab-org/gitlab-ce/issues/49713 for more information.
 %ul.list-unstyled.navbar-sub-nav
   - if dashboard_nav_link?(:projects)
-    = nav_link(path: ['root#index', 'projects#trending', 'projects#starred', 'dashboard/projects#index'], html_options: { id: 'nav-projects-dropdown', class: "home dropdown header-projects qa-projects-dropdown" }) do
+    = nav_link(path: ['root#index', 'projects#trending', 'projects#starred', 'dashboard/projects#index'], html_options: { id: 'nav-projects-dropdown', class: "home dropdown header-projects qa-projects-dropdown", data: { track_label: "projects_dropdown", track_event: "click_dropdown" } }) do
       %button{ type: 'button', data: { toggle: "dropdown" } }
         = _('Projects')
         = sprite_icon('angle-down', css_class: 'caret-down')
@@ -10,7 +10,7 @@
         = render "layouts/nav/projects_dropdown/show"
 
   - if dashboard_nav_link?(:groups)
-    = nav_link(controller: ['dashboard/groups', 'explore/groups'], html_options: { id: 'nav-groups-dropdown', class: "home dropdown header-groups qa-groups-dropdown" }) do
+    = nav_link(controller: ['dashboard/groups', 'explore/groups'], html_options: { id: 'nav-groups-dropdown', class: "home dropdown header-groups qa-groups-dropdown", data: { track_label: "groups_dropdown", track_event: "click_dropdown"  } }) do
       %button{ type: 'button', data: { toggle: "dropdown" } }
         = _('Groups')
         = sprite_icon('angle-down', css_class: 'caret-down')