[testing] Add test owner labels for some ao sparse tests (#163203)

I am trying to give some test files better owner labels than `module: unknown`.  I am not sure them, but they seem pretty reasonable
Pull Request resolved: https://github.com/pytorch/pytorch/pull/163203
Approved by: https://github.com/jcaip

test/ao/sparsity/test_activation_sparsifier.py

@@ -1,4 +1,4 @@
-# Owner(s): ["module: unknown"]
+# Owner(s): ["module: sparse"]
 
 import copy
 

test/ao/sparsity/test_composability.py

@@ -1,4 +1,4 @@
-# Owner(s): ["module: unknown"]
+# Owner(s): ["module: sparse"]
 
 
 import torch

test/ao/sparsity/test_data_scheduler.py

@@ -1,4 +1,4 @@
-# Owner(s): ["module: unknown"]
+# Owner(s): ["module: sparse"]
 
 import copy
 import warnings

test/ao/sparsity/test_data_sparsifier.py

@@ -1,4 +1,4 @@
-# Owner(s): ["module: unknown"]
+# Owner(s): ["module: sparse"]
 
 import copy
 import itertools

test/ao/sparsity/test_kernels.py

@@ -1,4 +1,4 @@
-# Owner(s): ["module: unknown"]
+# Owner(s): ["module: sparse"]
 
 import copy
 import io

test/ao/sparsity/test_parametrization.py

@@ -1,4 +1,4 @@
-# Owner(s): ["module: unknown"]
+# Owner(s): ["module: sparse"]
 
 
 import torch

test/ao/sparsity/test_scheduler.py

@@ -1,4 +1,4 @@
-# Owner(s): ["module: unknown"]
+# Owner(s): ["module: sparse"]
 
 import warnings
 

test/ao/sparsity/test_sparsifier.py

@@ -1,4 +1,4 @@
-# Owner(s): ["module: unknown"]
+# Owner(s): ["module: sparse"]
 
 import itertools
 import re

test/ao/sparsity/test_sparsity_utils.py

@@ -1,4 +1,4 @@
-# Owner(s): ["module: unknown"]
+# Owner(s): ["module: sparse"]
 
 
 import logging

test/ao/sparsity/test_structured_sparsifier.py

@@ -1,4 +1,4 @@
-# Owner(s): ["module: unknown"]
+# Owner(s): ["module: sparse"]
 import copy
 import random
 

test/test_ao_sparsity.py

@@ -1,4 +1,4 @@
-# Owner(s): ["module: unknown"]
+# Owner(s): ["module: sparse"]
 import logging
 
 # Kernels