Move user retirement scripts code from the tubular repo (#34063)

* refactor: Migragte user retirement scripts code from the tubular repo

scripts/user_retirement/utils/utils.py

@@ -0,0 +1,25 @@
+import os
+
+
+def envvar_get_int(var_name, default):
+    """
+    Grab an environment variable and return it as an integer.
+    If the environment variable does not exist, return the default.
+    """
+    return int(os.environ.get(var_name, default))
+
+
+def batch(batchable, batch_size=1):
+    """
+    Utility to facilitate batched iteration over a list.
+
+    Arguments:
+        batchable (list): The list to break into batches.
+
+    Yields:
+        list
+    """
+    batchable_list = list(batchable)
+    length = len(batchable_list)
+    for index in range(0, length, batch_size):
+        yield batchable_list[index:index + batch_size]