Send password rejection before kicking client

[DevOpsOfChaos]

Summary

• send the password rejection response synchronously before kicking the client
• avoid reporting a generic connection-lost error when joining a password-protected direct-IP game with a wrong password
• keep the existing WrongPassword client error path unchanged
• add deterministic client-side regression coverage for the wrong-password response

Root cause

The server queued the password response with sendMsgAsync() and immediately kicked the client afterwards. For wrong passwords this could close the connection before the queued "false" response was sent, so the client only observed a connection loss.

This PR sends the "false" password response synchronously before kicking the player. Successful password responses keep the existing async send path.

The regression test intentionally avoids asserting real socket delivery-vs-disconnect timing, because that would be brittle. Instead, it verifies that receiving GameMessage_Server_Password("false") triggers the existing ClientError::WrongPassword path and stops the client.

Validation

• Built Test_network locally with Visual Studio 2022 / Debug
• Ran Test_network.exe --run_test=GameClientTests/ClientReportsWrongPasswordResponse --report_level=short
  • 1 test case passed
  • 9 assertions passed
• Ran Test_network.exe --report_level=short
  • 14 test cases passed
  • 228 assertions passed
• Ran git diff --check

Fixes #1057

[Flow86]

This was probably a missed refactor thing, I remember that in an early version the KickPlayer flushed the queue of the disconnected player, but now its not doing that.

[DevOpsOfChaos]

Added deterministic client-side coverage for the wrong-password response path.

I avoided a socket timing test here; the new test verifies that receiving GameMessage_Server_Password("false") triggers ClientError::WrongPassword and stops the client.

Validation:

• targeted wrong-password test passed
• full Test_network passed: 14 tests, 228 assertions
• git diff --check

[Flamefire]

LGTM.