High-Scores: Add immutability test (#1486)

Add tests for immutability after calling personal best

Some solutions sort the array to find the largest.  This breaks any subsequent call for recent scores, and isn't as fast as calling max.  These two tests call recent and scores to verify that the scores have not changed.

* Update canonical-data.json

Add missing commas

* Update canonical-data.json

Removed redundant test that two property strings, rather than one

          "property": "personalTopThree", "latest",

* [CI] Format code

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: jeffdparker

exercises/high-scores/canonical-data.json

@@ -103,6 +103,26 @@
           },
           "expected": [30, 50, 20, 70],
           "scenarios": ["immutable"]
+        },
+        {
+          "uuid": "ddb0efc0-9a86-4f82-bc30-21ae0bdc6418",
+          "description": "Latest score after personal best",
+          "property": "latestAfterBest",
+          "input": {
+            "scores": [20, 70, 15, 25, 30]
+          },
+          "expected": 30,
+          "scenarios": ["immutable"]
+        },
+        {
+          "uuid": "6a0fd2d1-4cc4-46b9-a5bb-2fb667ca2364",
+          "description": "Scores after personal best",
+          "property": "scoresAfterBest",
+          "input": {
+            "scores": [20, 70, 15, 25, 30]
+          },
+          "expected": [20, 70, 15, 25, 30],
+          "scenarios": ["immutable"]
         }
       ]
     }