Re-enable optimized gelu test in CMake (#8667)

* Fix log_softmax along non-contiguous dim

Pull Request resolved: https://github.com/pytorch/executorch/pull/8595

#8382 certainly didn't fix this problem (and added it on x86), but I don't think it was correct on ARM prior to that either.

Added a regression test.
ghstack-source-id: 268149462
@exported-using-ghexport

Differential Revision: [D69928884](https://our.internmc.facebook.com/intern/diff/D69928884/)

* Re-enable optimized gelu test in CMake

Pull Request resolved: https://github.com/pytorch/executorch/pull/8597

I missed this line disabling the test. (Splitting out re-enable of log_softmax because I think that one needs fixes.)
ghstack-source-id: 268149463
@exported-using-ghexport

Differential Revision: [D69929122](https://our.internmc.facebook.com/intern/diff/D69929122/)

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Co-authored-by: Scott Wolchok <swolchok@meta.com>