[PyTorch][Vulkan]remove redundant test of log_softmax (#119964)
Summary: `vulkan_api_test.cpp` already has [a test for `log_softmax`](https://www.internalfb.com/code/fbsource/[c79b73bd7d5f661c81ff3cf999cfa1af664f0c48]/xplat/caffe2/aten/src/ATen/test/vulkan_api_test.cpp?lines=4521), so we remove the redundant `DISABLED_log_softmax`. According to the comment the test was disabled because "the op is not working correctly. Add it back when it is fixed." Actually it's a simple typo mistake: the [CPU output should use `at::log_softmax` instead of `at::softmax`](https://www.internalfb.com/code/fbsource/[c79b73bd7d5f661c81ff3cf999cfa1af664f0c48]/xplat/caffe2/aten/src/ATen/test/vulkan_api_test.cpp?lines=4548). Since we already have a test for `log_softmax`, the fix isn't necessary and we remove this disabled test.
Test Plan:
Full vulkan_api_test P1184744699:
```
LD_LIBRARY_PATH=third-party/swiftshader/lib/linux-x64/ buck2 run fbcode/mode/dev-nosan //xplat/caffe2:pt_vulkan_api_test_bin
...
[ SKIPPED ] VulkanAPITest.querypool_flushed_shader_log (0 ms)
[----------] 427 tests from VulkanAPITest (23633 ms total)
[----------] Global test environment tear-down
[==========] 427 tests from 1 test suite ran. (23634 ms total)
[ PASSED ] 426 tests.
[ SKIPPED ] 1 test, listed below:
[ SKIPPED ] VulkanAPITest.querypool_flushed_shader_log
```
Reviewed By: jorgep31415
Differential Revision: D53766200
Pull Request resolved: https://github.com/pytorch/pytorch/pull/119964
Approved by: https://github.com/jorgep31415
