tests: move tests top-level

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

tests/compute/invalid/bool/main.cue

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+package testing
+
+#dagger: compute: true

tests/compute/invalid/int/main.cue

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+package testing
+
+#dagger: compute: 123

tests/compute/invalid/overload/new_def/main.cue

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+package testing
+
+bar: #dagger: {
+
+	#new_def: "lala"
+
+	compute: [{
+		do:  "fetch-container"
+		ref: "busybox"
+	},
+		{
+			do: "exec"
+			args: ["true"]
+			dir: "/"
+		}]
+}

tests/compute/invalid/overload/new_prop/main.cue

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+package testing
+
+bar: #dagger: {
+
+	new_prop: "lala"
+
+	compute: [{
+		do:  "fetch-container"
+		ref: "busybox"
+	},
+		{
+			do: "exec"
+			args: ["true"]
+			dir: "/"
+		}]
+}

tests/compute/invalid/string/main.cue

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+package testing
+
+#dagger: compute: "whatever"

tests/compute/invalid/struct/main.cue

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+package testing
+
+#dagger: compute: whatever: "wrong"