zed-editor: enable cargo-nextest

Upstream is using cargo-nextest and some tests are actually failing
without it.

pkgs/by-name/ze/zed-editor/package.nix

@@ -225,23 +225,7 @@ rustPlatform.buildRustPackage (finalAttrs: {
     writableTmpDirAsHomeHook
   ];
 
-  checkFlags = [
-    # Flaky: unreliably fails on certain hosts (including Hydra)
-    "--skip=zed::tests::test_window_edit_state_restoring_enabled"
-    # The following tests are flaky on at least x86_64-linux and aarch64-darwin,
-    # where they sometimes fail with: "database table is locked: workspaces".
-    "--skip=zed::tests::test_open_file_in_many_spaces"
-    "--skip=zed::tests::test_open_non_existing_file"
-  ]
-  ++ lib.optionals stdenv.hostPlatform.isDarwin [
-    # Flaky: unreliably fails on certain hosts (including Hydra)
-    "--skip=zed::open_listener::tests::test_open_workspace_with_directory"
-    "--skip=zed::open_listener::tests::test_open_workspace_with_nonexistent_files"
-  ]
-  ++ lib.optionals stdenv.hostPlatform.isLinux [
-    # Fails on certain hosts (including Hydra) for unclear reason
-    "--skip=test_open_paths_action"
-  ];
+  useNextest = true;
 
   installPhase = ''
     runHook preInstall