fix: websocket server always should be bound to localhost

[iduartgomez]

This pull request includes changes to the crates/core and scripts directories, focusing on improving configuration handling, test stability, and script usability. The most important changes include modifying the WebSocket API configuration to always use the local address, increasing the sleep duration in tests to ensure node stability, and adding a help function to the update-remote-gws.sh script.

Configuration handling improvements:

• crates/core/src/config.rs: Modified the WebSocket API configuration to always use the local address by default.

Test stability improvements:

• crates/core/tests/operations.rs: Increased the sleep duration before connecting to the WebSocket API in test_put_contract and test_update_contract to ensure nodes have enough time to start up. [1] [2]

Script usability improvements:

• scripts/update-remote-gws.sh: Added a help function to provide usage information and describe expected artifacts and target servers.