Fix Flaky Test CommonExceptionDataTest#should_include_code_in_json_when_code_is_not_null

[pem70]

Issue

Test CommonExceptionDataTest#should_include_code_in_json_when_code_is_not_null is flaky. See #4991

Fix

This fix decodes the JSON and asserts the key–value pairs on a map, so the test checks semantic content instead of exact string formatting or key order. It keeps the original goal of verifying that both "code" and "message" fields have the correct values, while removing flakiness caused by unpredictable key ordering during JSON serialization.

Checklist

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[pem70]

已rebase, ci问题应已解决