Extensions: Remove IPEC extension (#2792)

* Remove browser extension payloads from Social Engineering modules

* Extensions: Remove IPEC extension

core/main/ar-migrations/022_create_ipec_exploit.rb

@@ -1,9 +0,0 @@
-class CreateIpecExploit < ActiveRecord::Migration[6.0]
-  def change
-    create_table :ipec_exploits do |t|
-      t.text :name
-      t.text :protocol
-      t.text :os
-    end
-  end
-end

core/main/ar-migrations/023_create_ipec_exploit_run.rb

@@ -1,9 +0,0 @@
-class CreateIpecExploitRun < ActiveRecord::Migration[6.0]
-  def change
-    create_table :ipec_exploit_runs do |t|
-      t.boolean :launched
-      t.text :http_headers
-      t.text :junk_size
-    end
-  end
-end