feat: testcase for whitelisted chars

.gitattributes

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+nonascii.txt text

conf.json

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+{
+  "stages": [
+    {
+      "name": "healthcheck",
+      "executor": {
+        "name": "sandbox",
+        "with": {
+          "default": {
+            "args": [
+              "/tmp/repo-health-checker",
+              "-root=.",
+              "-allowedDomainList=example.com",
+              "-whitelistedChars=\u6d4b"
+            ]
+          }
+        }
+      }
+    }
+  ]
+}

expected.json

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+{
+  "failed": false,
+  "msgContains": [
+    "### Non-ASCII Characters File Check Passed"
+  ],
+  "msgNotContains": [
+    "### Non-ASCII Characters File Check Failed"
+  ],
+  "stderrContains": []
+}

nonascii.txt

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+Allowed non-ASCII: 测