Rename tests with new naming convention and update tests lists

Signed-off-by: Tom Chauveau <tom.chauveau@epitech.eu>

tests/ops/subdir/valid/simple/main.cue

@@ -0,0 +1,26 @@
+package testing
+
+import "dagger.io/dagger/op"
+
+TestSimpleSubdir: {
+	string
+
+	#up: [
+		op.#FetchContainer & {
+			ref: "alpine"
+		},
+		op.#Exec & {
+			args: ["mkdir", "-p", "/tmp/foo"]
+		},
+		op.#Exec & {
+			args: ["sh", "-c", "echo -n world > /tmp/foo/hello"]
+		},
+		op.#Subdir & {
+			dir: "/tmp/foo"
+		},
+		op.#Export & {
+			source: "./hello"
+			format: "string"
+		},
+	]
+}