Update backup logic to use activity logs, not audit logs

app/Models/ActivityLogSubject.php

@@ -0,0 +1,40 @@
+<?php
+
+namespace Pterodactyl\Models;
+
+use Illuminate\Database\Eloquent\Relations\Pivot;
+
+/**
+ * \Pterodactyl\Models\ActivityLogSubject.
+ *
+ * @property int $id
+ * @property int $activity_log_id
+ * @property int $subject_id
+ * @property string $subject_type
+ * @property \Pterodactyl\Models\ActivityLog|null $activityLog
+ * @property \Illuminate\Database\Eloquent\Model|\Eloquent $subject
+ *
+ * @method static \Illuminate\Database\Eloquent\Builder|ActivityLogSubject newModelQuery()
+ * @method static \Illuminate\Database\Eloquent\Builder|ActivityLogSubject newQuery()
+ * @method static \Illuminate\Database\Eloquent\Builder|ActivityLogSubject query()
+ * @mixin \Eloquent
+ */
+class ActivityLogSubject extends Pivot
+{
+    public $incrementing = true;
+    public $timestamps = false;
+
+    protected $table = 'activity_log_subjects';
+
+    protected $guarded = ['id'];
+
+    public function activityLog()
+    {
+        return $this->belongsTo(ActivityLog::class);
+    }
+
+    public function subject()
+    {
+        return $this->morphTo();
+    }
+}