Include depth info in SelectionSetTooDeep error

crates/core-subsystem/core-resolver/src/validation/operation_validator.rs

@@ -74,7 +74,11 @@ impl<'a> OperationValidator<'a> {
                     self.normal_query_depth_limit
                 };
                 if depth > max_depth {
-                    Err(ValidationError::SelectionSetTooDeep(pos))
+                    Err(ValidationError::SelectionSetTooDeep {
+                        depth,
+                        max_depth,
+                        pos,
+                    })
                 } else {
                     Ok(true)
                 }

crates/core-subsystem/core-resolver/src/validation/snapshots/introspection_query_depth_limit_direct-2.snap

@@ -3,7 +3,9 @@ source: crates/core-subsystem/core-resolver/src/validation/document_validator.rs
 expression: validator.validate(create_query_document(query))
 ---
 Err(
-    SelectionSetTooDeep(
-        Pos(5:25),
-    ),
+    SelectionSetTooDeep {
+        depth: 3,
+        max_depth: 2,
+        pos: Pos(5:25),
+    },
 )

crates/core-subsystem/core-resolver/src/validation/snapshots/query_depth_limit_direct-2.snap

@@ -3,7 +3,9 @@ source: crates/core-subsystem/core-resolver/src/validation/document_validator.rs
 expression: validator.validate(create_query_document(query))
 ---
 Err(
-    SelectionSetTooDeep(
-        Pos(8:37),
-    ),
+    SelectionSetTooDeep {
+        depth: 6,
+        max_depth: 5,
+        pos: Pos(8:37),
+    },
 )

crates/core-subsystem/core-resolver/src/validation/snapshots/query_depth_limit_through_fragment-2.snap

@@ -3,7 +3,9 @@ source: crates/core-subsystem/core-resolver/src/validation/document_validator.rs
 expression: validator.validate(create_query_document(query))
 ---
 Err(
-    SelectionSetTooDeep(
-        Pos(14:25),
-    ),
+    SelectionSetTooDeep {
+        depth: 6,
+        max_depth: 5,
+        pos: Pos(14:25),
+    },
 )

crates/core-subsystem/core-resolver/src/validation/validation_error.rs

@@ -72,8 +72,12 @@ pub enum ValidationError {
     #[error("Fragment cycle detected: {0}")]
     FragmentCycle(String, Pos),
 
-    #[error("Selection set too deep")]
-    SelectionSetTooDeep(Pos),
+    #[error("Selection set depth {depth} exceeds the maximum allowed depth {max_depth}")]
+    SelectionSetTooDeep {
+        depth: usize,
+        max_depth: usize,
+        pos: Pos,
+    },
 
     #[error("Invalid value for '{value_name}': {range_detail}, {value_detail}")]
     ValueOutOfRange {
@@ -106,7 +110,7 @@ impl ValidationError {
             ValidationError::MultipleOperationsUnmatchedOperationName(_) => vec![],
             ValidationError::InvalidArgumentType { pos, .. } => vec![*pos],
             ValidationError::FragmentCycle(_, pos) => vec![*pos],
-            ValidationError::SelectionSetTooDeep(pos) => vec![*pos],
+            ValidationError::SelectionSetTooDeep { pos, .. } => vec![*pos],
             ValidationError::ValueOutOfRange { pos, .. } => vec![*pos],
         }
     }

integration-tests/error-reporting/tests/over-the-limit-query-depth.exotest

@@ -23,7 +23,7 @@ response: |
     {
       "errors": [
         {
-          "message": "Selection set too deep",
+          "message": "Selection set depth 6 exceeds the maximum allowed depth 5",
           "locations": [
             {
               "line": 11,