Update base for Update on "[8/n][ET-VK] Support staging any 8-bit texture"

"bitw8" = bit width 8, which is equivalent to 8-bit. We use "bitw8" as the name since shader compilation disallows names starting with a digit.

Changes follow from #4485 to support `texture2d` and support `uint8`, respectively.

Differential Revision: [D63918659](https://our.internmc.facebook.com/intern/diff/D63918659/)

[ghstack-poisoned]

Author: jorgep31415

backends/vulkan/test/op_tests/cases.py

@@ -766,7 +766,7 @@ def get_repeat_inputs():
     test_suite_3d.storage_types = ["utils::kTexture3D"]
     test_suite_3d.data_gen = "make_seq_tensor"
     test_suite_3d.dtypes = ["at::kFloat"]
-    test_suite_2d.test_name_suffix = "3d"
+    test_suite_3d.test_name_suffix = "3d"
 
     return [test_suite_2d, test_suite_3d]