test: add regression test for --preload with same module as main

Author: fraidev

tests/specs/run/preload_same_module/__test__.jsonc

@@ -0,0 +1,5 @@
+{
+  "args": "run --preload main.ts main.ts",
+  "exitCode": 0,
+  "output": "main.out"
+}

tests/specs/run/preload_same_module/main.out

@@ -0,0 +1 @@
+executed

tests/specs/run/preload_same_module/main.ts

@@ -0,0 +1 @@
+console.log("executed");