Add back missing foreign key violation test cases

- Add tests for basic FK violations with non-existent parent values
- Test both same precision (99.99) and different precision (99.9) violations
- Ensures comprehensive coverage of FK constraint validation scenarios

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: elianddb

enginetest/queries/script_queries.go

@@ -10206,6 +10206,14 @@ where
 				Query:       "insert into child_dec_65_30 values (1.23);",
 				ExpectedErr: sql.ErrForeignKeyChildViolation,
 			},
+			{
+				Query:       "insert into child_dec_4_2 values (99.99);",
+				ExpectedErr: sql.ErrForeignKeyChildViolation,
+			},
+			{
+				Query:       "insert into child_dec_4_1 values (99.9);",
+				ExpectedErr: sql.ErrForeignKeyChildViolation,
+			},
 		},
 	},