[3.13] gh-138257: Fix internal `RuleCollectorVisitor` attribute name (GH-138208) (#138260)

gh-138257: Fix internal `RuleCollectorVisitor` attribute name (GH-138208)

The internal `RuleCollectorVisitor` class had an attribute named "rulses"
instead of "rules" that other `GrammarVisitor` subclasses define.
(cherry picked from commit 11217a883da324b85a290f5d78f090d8f4880f16)

Co-authored-by: chemelnucfin <3982092+chemelnucfin@users.noreply.github.com>