[Android][Tx execution] Show error if the connected key balance is not sufficient

[liliya-soroka]

Describe the bug Show error if the connected key balance is not sufficient

To Reproduce Steps to reproduce the behavior:

1. Try to execute tx using key with insufficient balance Current result: No error

Expected behavior The error "Insufficient balance for network fee" should be displayed

Screenshots

Smartphone (please complete the following information):

• Device: pixel 6
• Android Version: android 13
• App Version 3.8.0 -3987

Environment prod Additional context

[liliya-soroka]

Verified app version 3.8.0 -4000 the notification message appears