feat: remove blocked-at usage

The package never really worked with Zep, causing the
entire bot to freeze instead.

backend/src/plugins/BotControl/commands/ToggleBlockDetectionCmd.ts

@@ -1,33 +0,0 @@
-import { commandTypeHelpers as ct } from "../../../commandTypes";
-import { botControlCmd } from "../types";
-import blockedAt from "blocked-at";
-
-let stop;
-
-export const ToggleBlockDetectionCmd = botControlCmd({
-  trigger: ["toggle_block_detection"],
-  permission: "can_performance",
-
-  signature: {
-    threshold: ct.number({ required: false }),
-  },
-
-  async run({ pluginData, message: msg, args }) {
-    if (stop) {
-      stop();
-      stop = null;
-      msg.channel.send("Disabled block detection");
-      return;
-    }
-
-    const threshold = args.threshold || 1000;
-    const result = blockedAt(
-      (time, stack) => {
-        console.error(`Blocked for ${time}ms, operation started here:`, stack);
-      },
-      { threshold },
-    );
-    stop = result.stop;
-    msg.channel.send(`Block detection enabled with ${threshold}ms threshold`);
-  },
-});