[fbsync] [Nova] Disable CircleCI Linux CPU Unittests (#6968)

Summary:
* [Nova] Disable CircleCI Linux Unittests

* add back linux gpu jobs

Reviewed By: YosuaMichael

Differential Revision: D41648539

fbshipit-source-id: d865e38327d5132392db3e87fd62f8b9790b0c5a

Author: NicolasHug

.circleci/config.yml

@@ -250,6 +250,8 @@ def unittest_workflows(indentation=6):
         for device_type in ["cpu", "gpu"]:
             if os_type == "macos" and device_type == "gpu":
                 continue
+            if os_type == "linux" and device_type == "cpu":
+                continue
             for i, python_version in enumerate(PYTHON_VERSIONS):
                 job = {
                     "name": f"unittest_{os_type}_{device_type}_py{python_version}",