test(spring): wait for network stake data in CI

Signed-off-by: Aman <amkr6207@gmail.com>

Author: amkr6207

hiero-enterprise-spring/src/test/java/org/hiero/spring/test/NetworkRepositoryTest.java

@@ -35,8 +35,15 @@ void findNetworkFees() throws HieroException {
   }
 
   @Test
-  void findNetworkStake() throws HieroException {
-    Optional<NetworkStake> result = networkRepository.stake();
+  void findNetworkStake() throws HieroException, InterruptedException {
+    Optional<NetworkStake> result = Optional.empty();
+
+    for (int attempt = 0; attempt < 10 && result.isEmpty(); attempt++) {
+      result = networkRepository.stake();
+      if (result.isEmpty()) {
+        Thread.sleep(500);
+      }
+    }
 
     Assertions.assertNotNull(result);
     Assertions.assertTrue(result.isPresent());