Solomon 4968b6b9d0
fix error when exporting consts with type signatures in modules (#14118)
Fixes #14023

# Description

- Prevents "failed to find added variable" when modules export constants
  with type signatures:

```nushell
> module foo { export const bar: int = 2 }
Error: nu::parser::unknown_state

  × Internal error.
   ╭─[entry #1:1:21]
 1 │ module foo { export const bar: int = 2 }
   ·                     ─────────┬────────
   ·                              ╰── failed to find added variable
```

- Returns `name_is_builtin_var` errors for names with type signatures:

```nushell
> let env: string = "";
Error: nu::parser::name_is_builtin_var

  × `env` used as variable name.
   ╭─[entry #1:1:5]
 1 │ let env: string = "";
   ·     ─┬─
   ·      ╰── already a builtin variable
```
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