Decouple node help between sidebar and right panel (#8110)

## Summary

When the node library is open and you click on the node toolbar info
button, this causes the node library info panel & right panel node info
to show the same details.

## Changes

- Extract useNodeHelpContent composable so NodeHelpContent fetches its
own content, allowing multiple panels to show help independently
- Remove sync behavior from NodeHelpPage that caused left sidebar to
change when selecting different graph nodes since we want to prioritise
right panel for this behavior
- Add telemetry tracking for node library help button to identify how
frequently this is used

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8110-Decouple-node-help-between-sidebar-and-right-panel-2ea6d73d365081a9b3afd25aa51b34bd)
by [Unito](https://www.unito.io)

src/components/node/NodeHelpContent.vue

@@ -70,17 +70,17 @@
 </template>
 
 <script setup lang="ts">
-import { storeToRefs } from 'pinia'
 import ProgressSpinner from 'primevue/progressspinner'
 import { computed } from 'vue'
 
+import { useNodeHelpContent } from '@/composables/useNodeHelpContent'
 import type { ComfyNodeDefImpl } from '@/stores/nodeDefStore'
-import { useNodeHelpStore } from '@/stores/workspace/nodeHelpStore'
 
-const { node } = defineProps<{ node: ComfyNodeDefImpl }>()
+const { node } = defineProps<{
+  node: ComfyNodeDefImpl
+}>()
 
-const nodeHelpStore = useNodeHelpStore()
-const { renderedHelpHtml, isLoading, error } = storeToRefs(nodeHelpStore)
+const { renderedHelpHtml, isLoading, error } = useNodeHelpContent(() => node)
 
 const inputList = computed(() =>
   Object.values(node.inputs).map((spec) => ({