feat: Enhance Send flow Automation Integration Test Flow

This change:
- Updates test wallet address in CommonTestConstants.
- Modifies startAppFlow to accept a dynamic key.
- Improves waitForSendPage and checkIfSendPageIsVisible methods for better page visibility handling.
- Adds validateWalletBalance method to ensure sufficient funds before sending.
- Enhances transaction success flow handling in SendPageRobot.

Author: Blazebrain

integration_test/components/common_test_constants.dart

@@ -10,5 +10,5 @@ class CommonTestConstants {
   static final CryptoCurrency sendTestReceiveCurrency = CryptoCurrency.sol;
   static final CryptoCurrency exchangeTestReceiveCurrency = CryptoCurrency.usdtSol;
   static final CryptoCurrency exchangeTestDepositCurrency = CryptoCurrency.sol;
-  static final String testWalletAddress = '5v9gTW1yWPffhnbNKuvtL2frevAf4HpBMw8oYnfqUjhm';
+  static final String testWalletAddress = '7TSTXnQZxQDA4JoNqs4DqVqE7oNWk2kmHkMT6DD6vw2S';
 }

integration_test/components/common_test_flows.dart

@@ -60,9 +60,9 @@ class CommonTestFlows {
 
   //* ========== Handles flow to start the app afresh and accept disclaimer =============
   Future<void> startAppFlow(Key key) async {
-    await app.main(topLevelKey: ValueKey('send_flow_test_app_key'));
+    await app.main(topLevelKey: key);
 
-    await _tester.pumpAndSettle();
+    await _tester.pump(Duration(seconds: 2));
 
     // // --------- Disclaimer Page ------------
     // // Tap checkbox to accept disclaimer