tests: convert tests to new style

Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>

tests/ops/export/json/main.cue

@@ -44,20 +44,16 @@ TestExportList: {
 	[...string]
 
 	#up: [
-		{
-			do:  "fetch-container"
+		op.#FetchContainer & {
 			ref: "alpine"
 		},
-		{
-			do: "exec"
+		op.#Exec & {
 			args: ["sh", "-c", """
 				echo '["milk", "pumpkin pie", "eggs", "juice"]' > /tmp/out
 				""",
 			]
-			dir: "/"
 		},
-		{
-			do: "export"
+		op.#Export & {
 			// Source path in the container
 			source: "/tmp/out"
 			format: "json"