YT-18571: fix YT enums' uniqueness check

Otherwise, enums like this compile successfully:
```
DEFINE_ENUM(ENonUnique,
  ((Foo1) (0))
  ((Foo2) (0))
  ((Foo3) (0))
  ((Foo4) (0))
);
```

1 files changed, 1 insertions, 9 deletions

diff --git a/library/cpp/yt/misc/enum-inl.h b/library/cpp/yt/misc/enum-inl.h
index ba33290e79..951e93c130 100644
--- a/library/cpp/yt/misc/enum-inl.h
+++ b/library/cpp/yt/misc/enum-inl.h
@@ -41,15 +41,7 @@ namespace NDetail {
 template <typename TValues>
 constexpr bool CheckValuesMonotonic(const TValues& values)
 {
-    if (std::size(values) <= 1) {
-        return true;
-    }
-    for (size_t i = 0; i < std::size(values) - 1; ++i) {
-        if (values[i] > values[i + 1]) {
-            return false;
-        }
-    }
-    return true;
+    return std::adjacent_find(values.begin(), values.end(), std::greater_equal<>()) == values.end();
 }
 
 template <typename TValues>