fix: formData upload broken in debug builds (#56406)

Summary:
So  the formData Upload in fetch is broken on 0.85 on main.
I tracked down this PR #55456
Also reported here #56404
RCA:-
```
body.isOneShot()
body.writeTo(buffer)  // This is  draining inner file InputStreams
```
Fix is to walk to each children of multipart and check for Oneshot
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[ANDROID][FIXED] - FormData uploads broken in debug builds

Pull Request resolved: #56406

Test Plan:
Tested on RN tester
<img width="416" height="600" alt="image" src="https://github.com/user-attachments/assets/20cae662-e2ba-4fc7-9f8d-d8e365eb95b2" />

Reviewed By: fabriziocucci, huntie

Differential Revision: D100258994

Pulled By: alanleedev

fbshipit-source-id: aeda47d45db2152027598c949f0e602a586c4cb3

Author: riteshshukla04

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/modules/network/NetworkEventUtil.kt

@@ -19,6 +19,7 @@ import com.facebook.react.internal.featureflags.ReactNativeFeatureFlags
 import java.io.IOException
 import java.net.SocketTimeoutException
 import okhttp3.Headers
+import okhttp3.MultipartBody
 import okhttp3.RequestBody
 import okio.Buffer
 
@@ -263,6 +264,13 @@ internal object NetworkEventUtil {
       return "[Preview unavailable]"
     }
 
+    // MultipartBody does not propagate isOneShot() from its parts, so check each
+    // part explicitly. Reading a one-shot part here would drain the underlying
+    // stream and cause the real request to fail.
+    if (body is MultipartBody && body.parts().any { it.body().isOneShot() }) {
+      return "[Preview unavailable]"
+    }
+
     return try {
       val buffer = Buffer()
       body.writeTo(buffer)

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/modules/network/RequestBodyUtil.kt

@@ -146,6 +146,8 @@ internal object RequestBodyUtil {
         }
       }
 
+      override fun isOneShot(): Boolean = true
+
       @Throws(IOException::class)
       override fun writeTo(sink: BufferedSink) {
         var source: Source? = null