re-add missing lexer entry for selector syntax

Author: jbaiera

x-pack/plugin/esql/src/main/antlr/lexer/From.g4

@@ -17,6 +17,7 @@ FROM_PIPE : PIPE -> type(PIPE), popMode;
 FROM_OPENING_BRACKET : OPENING_BRACKET -> type(OPENING_BRACKET);
 FROM_CLOSING_BRACKET : CLOSING_BRACKET -> type(CLOSING_BRACKET);
 FROM_COLON : COLON -> type(COLON);
+FROM_SELECTOR : {this.isDevVersion()}? CAST_OP -> type(CAST_OP);
 FROM_COMMA : COMMA -> type(COMMA);
 FROM_ASSIGN : ASSIGN -> type(ASSIGN);
 METADATA : 'metadata';