tests: remove default nox sessions

Author: parthea

packages/google-auth-oauthlib/noxfile.py

@@ -74,18 +74,6 @@
 
 CURRENT_DIRECTORY = pathlib.Path(__file__).parent.absolute()
 
-nox.options.sessions = [
-    "unit",
-    "system",
-    "cover",
-    "lint",
-    "lint_setup_py",
-    "blacken",
-    "docs",
-    "docfx",
-    "format",
-]
-
 # Error if a python version is missing
 nox.options.error_on_missing_interpreters = True