fix: generate posix paths for migrations (#11468)

Fixes: FRMW-2913

Related Github issue - https://github.com/medusajs/medusa/issues/11330

packages/core/utils/src/common/index.ts

@@ -81,4 +81,5 @@ export * from "./upper-case-first"
 export * from "./validate-handle"
 export * from "./wrap-handler"
 export * from "./merge-plugin-modules"
-export * from "./merge-metadata"
+export * from "./to-unix-slash"
+export * from "./merge-metadata"

packages/core/utils/src/common/to-unix-slash.ts

@@ -0,0 +1,8 @@
+export function toUnixSlash(path: string) {
+  const isExtendedLengthPath = path.startsWith("\\\\?\\")
+  if (isExtendedLengthPath) {
+    return path
+  }
+
+  return path.replace(/\\/g, "/")
+}