refactor(parser): unified behavior of parse_export_env

Author: blindFS

crates/nu-parser/src/parser.rs

@@ -6127,6 +6127,7 @@ pub fn parse_builtin_commands(
         b"extern" => parse_extern(working_set, lite_command, None),
         // `parse_export_in_block` also handles attributes by itself
         b"export" => parse_export_in_block(working_set, lite_command),
+        b"export-env" => parse_export_env(working_set, &lite_command.parts).0,
         // Other definitions can't have attributes, so we handle attributes here with parse_attribute_block
         _ if lite_command.has_attributes() => parse_attribute_block(working_set, lite_command),
         b"let" => parse_let(