feat: add telemetry to answer for user failed to find template (#6489)

## Summary

Adds mixpanel telemetry with goal of: "We currently only know when a
user opens a template workflow. But we also want to know if they failed
to find what they want"

Example mixpanel query: 

```
app:template_library_closed
  WHERE template_selected = false AND time_spent_seconds >= 10
  ```

But can drill down further into what filters were selected etc to answer what they were looking for but couldn't find. 

```
 1. Event: app:template_filter_changed
  2. Filter:
- Add formula: "Where user also triggered app:template_library_closed
with template_selected = false in same session"
  3. Breakdown by: search_query
  4. Sort by: Total Count (descending)

  Search Query           Failed Sessions
  -----------------------------------
  "flux video"             45 times
  "sdxl controlnet"     32 times
  "upscaler"               28 times
  (empty/just filter)   20 times
```

```
 Event: app:template_filter_changed
  WHERE filtered_count = 0
    AND user did app:template_library_closed
    with template_selected = false

  Breakdown by: search_query
  ```
  etc.


https://www.notion.so/comfy-org/Number-of-users-who-open-the-template-library-and-where-do-they-click-29b6d73d36508044a595c0fb653ca6dc?source=copy_link

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6489-feat-add-telemetry-to-answer-for-user-failed-to-find-template-29d6d73d365081cdad72fd7c6ada5dc7)
by [Unito](https://www.unito.io)

src/components/sidebar/ComfyMenuButton.vue

@@ -76,6 +76,7 @@ import { useI18n } from 'vue-i18n'
 
 import SettingDialogHeader from '@/components/dialog/header/SettingDialogHeader.vue'
 import ComfyLogoTransparent from '@/components/icons/ComfyLogoTransparent.vue'
+import { useWorkflowTemplateSelectorDialog } from '@/composables/useWorkflowTemplateSelectorDialog'
 import SettingDialogContent from '@/platform/settings/components/SettingDialogContent.vue'
 import { useColorPaletteService } from '@/services/colorPaletteService'
 import { useCommandStore } from '@/stores/commandStore'
@@ -160,7 +161,7 @@ const extraMenuItems = computed(() => [
     key: 'browse-templates',
     label: t('menuLabels.Browse Templates'),
     icon: 'icon-[comfy--template]',
-    command: () => commandStore.execute('Comfy.BrowseTemplates')
+    command: () => useWorkflowTemplateSelectorDialog().show('menu')
   },
   {
     key: 'settings',

src/components/sidebar/SidebarTemplatesButton.vue

@@ -12,19 +12,18 @@
 <script setup lang="ts">
 import { computed } from 'vue'
 
+import { useWorkflowTemplateSelectorDialog } from '@/composables/useWorkflowTemplateSelectorDialog'
 import { useSettingStore } from '@/platform/settings/settingStore'
-import { useCommandStore } from '@/stores/commandStore'
 
 import SidebarIcon from './SidebarIcon.vue'
 
 const settingStore = useSettingStore()
-const commandStore = useCommandStore()
 
 const isSmall = computed(
   () => settingStore.get('Comfy.Sidebar.Size') === 'small'
 )
 
 const openTemplates = () => {
-  void commandStore.execute('Comfy.BrowseTemplates')
+  useWorkflowTemplateSelectorDialog().show('sidebar')
 }
 </script>