nixos/release.nix: disable tests.ec2-config (#46830)

This test doesn't work in a sandbox and never succeeded on Hydra.
It simulates an EC2 instance reconfiguring itself at runtime,
which needs network access.

(cherry picked from commit a83d61b)

nixos/release.nix

@@ -284,7 +284,8 @@ in rec {
   tests.ecryptfs = callTest tests/ecryptfs.nix {};
   tests.etcd = callTestOnMatchingSystems ["x86_64-linux"] tests/etcd.nix {};
   tests.ec2-nixops = (callSubTestsOnMatchingSystems ["x86_64-linux"] tests/ec2.nix {}).boot-ec2-nixops or {};
-  tests.ec2-config = (callSubTestsOnMatchingSystems ["x86_64-linux"] tests/ec2.nix {}).boot-ec2-config or {};
+  # ec2-config doesn't work in a sandbox as the simulated ec2 instance needs network access
+  #tests.ec2-config = (callSubTestsOnMatchingSystems ["x86_64-linux"] tests/ec2.nix {}).boot-ec2-config or {};
   tests.elk = callSubTestsOnMatchingSystems ["x86_64-linux"] tests/elk.nix {};
   tests.env = callTest tests/env.nix {};
   tests.ferm = callTest tests/ferm.nix {};