Update task metadata (learning-process#502)

Author: allnes

tasks/example_processes/info.json

@@ -3,6 +3,8 @@
     "first_name": "<value>",
     "last_name": "<value>",
     "middle_name": "<value>",
-    "group_number": "<value>"
+    "group_number": "<value>",
+    "task_number": "<value>",
+    "variant_number": "<value>"
   }
 }

tasks/example_threads/info.json

@@ -3,6 +3,8 @@
     "first_name": "<value>",
     "last_name": "<value>",
     "middle_name": "<value>",
-    "group_number": "<value>"
+    "group_number": "<value>",
+    "task_number": "<value>",
+    "variant_number": "<value>"
   }
 }