test(jspg): rename items fixture to array and resolve unused HashMap warning

- Rename fixtures/items.json to fixtures/array.json to better reflect array testing constraints.
- Update reference paths in src/tests/fixtures.rs and across other fixture JSON files.
- Remove unused HashMap import in src/validator/rules/dict.rs to resolve the compiler warning.

fixtures/propertyNames.json

@@ -43,8 +43,8 @@
             {
               "code": "MAX_LENGTH_VIOLATED",
               "values": {
-                "count": "6",
-                "limit": "3"
+                "limit": "3",
+                "count": "6"
               },
               "details": {
                 "path": "",
@@ -141,7 +141,8 @@
             {
               "code": "PATTERN_VIOLATED",
               "values": {
-                "pattern": "^a+$"
+                "pattern": "^a+$",
+                "value": "aaA"
               },
               "details": {
                 "path": "",
@@ -430,8 +431,8 @@
             {
               "code": "MAX_LENGTH_VIOLATED",
               "values": {
-                "limit": "3",
-                "count": "6"
+                "count": "6",
+                "limit": "3"
               },
               "details": {
                 "path": "",