chore(orchestration): prevent throwing on already defined workflow (#5337)

**What**
At the moment, when importing something from medusa entry point, if two medusa packages are installed because of a plugin, the evaluation of the import can end up throwing that a workflow is already defined. To prevent that from happening, we can just not throw if it is already defined and just return prematurely and make it idempotent.

packages/utils/src/common/deep-equal-obj.ts

@@ -0,0 +1,24 @@
+export function deepEqualObj(obj1: object, obj2: object): boolean {
+  if (typeof obj1 !== typeof obj2) {
+    return false
+  }
+
+  if (typeof obj1 !== "object" || obj1 === null) {
+    return obj1 === obj2
+  }
+
+  const obj1Keys = Object.keys(obj1)
+  const obj2Keys = Object.keys(obj2)
+
+  if (obj1Keys.length !== obj2Keys.length) {
+    return false
+  }
+
+  for (const key of obj1Keys) {
+    if (!obj2Keys.includes(key) || !deepEqualObj(obj1[key], obj2[key])) {
+      return false
+    }
+  }
+
+  return true
+}