Redesign policy running (#6609)

# Description of Changes
Redesign policy running so the server is in charge of policy IDs and
running, to make it impossible to have the frontend miss the results.
This solves a minor bug that we currently have in policies, where if you
load a file and then refresh while the policy is running, you'll never
receive the outputted file.

.taskfiles/frontend.yml

@@ -374,3 +374,15 @@ tasks:
     deps: [install]
     cmds:
       - node editor/scripts/generate-licenses.js
+
+  # ============================================================
+  # Clean
+  # ============================================================
+
+  clean:
+    desc: "Clean build artifacts and caches"
+    cmds:
+      - cmd: powershell rm -Recurse -Force -ErrorAction SilentlyContinue node_modules/.vite, editor/dist, dist, dist-portal
+        platforms: [windows]
+      - cmd: rm -rf node_modules/.vite editor/dist dist dist-portal
+        platforms: [linux, darwin]