[refactor] Migrate manager code from src/composables to src/workbench/extensions/manager (2/2) (#5722)

## Summary

Continuation of

- https://github.com/Comfy-Org/ComfyUI_frontend/pull/5662

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-5722-refactor-Migrate-manager-code-from-src-composables-to-src-workbench-extensions-manag-2766d73d36508165a4f5e1940967248f)
by [Unito](https://www.unito.io)

---------

Co-authored-by: Alexander Brown <drjkl@comfy.org>

src/workbench/extensions/manager/composables/nodePack/usePackUpdateStatus.ts

@@ -0,0 +1,35 @@
+import { compare, valid } from 'semver'
+import { computed } from 'vue'
+
+import type { components } from '@/types/comfyRegistryTypes'
+import { useComfyManagerStore } from '@/workbench/extensions/manager/stores/comfyManagerStore'
+
+export const usePackUpdateStatus = (
+  nodePack: components['schemas']['Node']
+) => {
+  const { isPackInstalled, getInstalledPackVersion } = useComfyManagerStore()
+
+  const isInstalled = computed(() => isPackInstalled(nodePack?.id))
+  const installedVersion = computed(() =>
+    getInstalledPackVersion(nodePack.id ?? '')
+  )
+  const latestVersion = computed(() => nodePack.latest_version?.version)
+
+  const isNightlyPack = computed(
+    () => !!installedVersion.value && !valid(installedVersion.value)
+  )
+
+  const isUpdateAvailable = computed(() => {
+    if (!isInstalled.value || isNightlyPack.value || !latestVersion.value) {
+      return false
+    }
+    return compare(latestVersion.value, installedVersion.value) > 0
+  })
+
+  return {
+    isUpdateAvailable,
+    isNightlyPack,
+    installedVersion,
+    latestVersion
+  }
+}