[ci] skip slow gradcheck jobs (#80311)

Skip to restore the CI while we investigate
Pull Request resolved: #80311
Approved by: https://github.com/janeyx99

.github/workflows/periodic.yml

@@ -14,13 +14,15 @@ concurrency:
 
 jobs:
   linux-xenial-cuda10_2-py3-gcc7-slow-gradcheck-build:
+    if: false # https://github.com/pytorch/pytorch/issues/80314
     name: linux-xenial-cuda10.2-py3-gcc7-slow-gradcheck
     uses: ./.github/workflows/_linux-build.yml
     with:
       build-environment: linux-xenial-cuda10.2-py3-gcc7-slow-gradcheck
       docker-image-name: pytorch-linux-xenial-cuda10.2-cudnn7-py3-gcc7
 
   linux-xenial-cuda10_2-py3-gcc7-slow-gradcheck-test:
+    if: false # https://github.com/pytorch/pytorch/issues/80314
     name: linux-xenial-cuda10.2-py3-gcc7-slow-gradcheck
     uses: ./.github/workflows/_linux-test.yml
     needs: linux-xenial-cuda10_2-py3-gcc7-slow-gradcheck-build