feat: conditionally set Content-Type header for non-multipart requests in CoreAPI

Author: AbhishekA1509

src/Common/API/CoreAPI.ts

@@ -55,9 +55,13 @@ class CoreAPI {
             method: type,
             signal,
             body: data ? JSON.stringify(data) : undefined,
-            headers: {
-                'Content-Type': 'application/json',
-            },
+            ...(data && !isMultipartRequest
+                ? {
+                      headers: {
+                          'Content-Type': 'application/json',
+                      },
+                  }
+                : {}),
         }
         // eslint-disable-next-line dot-notation
         options['credentials'] = 'include' as RequestCredentials