Cannot execute script with variable declarations

### Description

When I have a script (batch) for SQL Server that contains variable declaration

```
DECLARE @month DATETIME = '2026-03-01';
SELECT @month;
```

I can execute it by selecting everything with CTRL+A and then issuing CTRL+Enter but this is not optimal (too much hassle having to select everything every time). So I have tried the option Execute SQL Script (ALT+X) but this gives error:

```
Error occurred during SQL query execution
SQL Error [137] [S0002]: Must declare the scalar variable "@month".
Must declare the scalar variable "@month".
```

### DBeaver Version

Community Edition 26.0.1

### Operating System

Windows 11

### Database and driver

com.microsoft.sqlserver.jdbc.SQLServerDriver 13.2.1.jre11

### Steps to reproduce

Create script

```
DECLARE @month DATETIME = '2026-03-01';
SELECT @month;
```

Issue ALT+X

### Additional context