Improve error handling in connSocketBlockingConnect for various connction failures (#13008)

This commit addresses a problem in connSocketBlockingConnect where
different types of connection failures, including timeouts and other
errors, were not consistently handled. Previously, the function did not
return C_ERR immediately after detecting a connection failure, which
could lead to inconsistent states and misinterpretation of the
connection status.

With this update, connSocketBlockingConnect now correctly returns C_ERR
upon encountering any connection error, ensuring that all types of
connection failures are handled consistently and the behavior of the
function aligns with expected outcomes in case of connection issues.

Closes #12900

src/socket.c

@@ -361,6 +361,7 @@ static int connSocketBlockingConnect(connection *conn, const char *addr, int por
     if ((aeWait(fd, AE_WRITABLE, timeout) & AE_WRITABLE) == 0) {
         conn->state = CONN_STATE_ERROR;
         conn->last_errno = ETIMEDOUT;
+        return C_ERR;
     }
 
     conn->fd = fd;