added method to generate single id_number

src/utils/contacts/generate_random_passport_id.py

@@ -32,6 +32,9 @@ def get_random_number(size=6) -> str:
     ran = ''.join(random.choices(string.digits, k=size))
     return ran
 
+def generate_single_titre_sejour_number() -> str:
+    id_number = prefix_tire_de_sejour + get_random_number()
+    return id_number
 
 def generate_titre_sejour_number(size=10) -> list:
     number_list = []