Linter allows compare different enums

[westito]

Describe the issue
Linter allows comparing different enums, despite unrelated_type_equality_checks enabled

To Reproduce

enum FilterGroupBy { date, competitions }
enum FilterMatchSelection { allMatches, onlyFavorites }

FilterGroupBy groupBy = FilterGroupBy.date;
FilterMatchSelection matchSelection = FilterMatchSelection.allMatches;

// No linter error
if (groupBy == FilterMatchSelection.onlyFavorites) {
}

// Comparing variables allowed either
if (groupBy == matchSelection) {
}

// Linter: Equality operator `==` invocation with references of unrelated types.
if (groupBy == 0) {
}

Expected behavior
Linter shows unrelated types error

Version
Dart SDK version: 2.16.0 (stable) (Mon Jan 31 15:28:59 2022 +0100) on "macos_x64"

[srawlins]

Fixed with dart-archive/linter#4282