Run NO_AVX jobs on CPU (#41565)
Summary:
Delete "nogpu" job since both "AVX" and "AVX2" jobs already act like one
Fix naming problem when NO_AVX_NO_AVX2 job and NO_AVX2 jobs were semantically identical, due to the following logic in test.sh:
```
if [[ "${BUILD_ENVIRONMENT}" == *-NO_AVX-* ]]; then
export ATEN_CPU_CAPABILITY=default
elif [[ "${BUILD_ENVIRONMENT}" == *-NO_AVX2-* ]]; then
export ATEN_CPU_CAPABILITY=avx
fi
```
Pull Request resolved: https://github.com/pytorch/pytorch/pull/41565
Reviewed By: seemethere
Differential Revision: D22584743
Pulled By: malfet
fbshipit-source-id: 783cce60f35947b5d1e8b93901db36371ef78243
