Verify handling of Japanese characters

[wsobel]

Added unit test to check if Japanese characters will pass through the agent unchanged in XML and JSON

[Copilot]

Pull request overview

This PR adds a unit test to verify that Japanese characters are properly handled and preserved when passed through the MTConnect agent in both XML and JSON response formats.

Changes:

• Added new test case should_handle_japanese_characters that validates Japanese character handling in both XML and JSON formats
• Added PARSE_JSON_RESPONSE_QUERY macro to complement the existing XML equivalent for consistency
• Minor formatting improvement to an existing test assertion

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
test_package/agent_test.cpp	Added comprehensive test case for Japanese character handling in XML and JSON responses; enabled JSON version 2 in test setup
test_package/agent_test_helper.hpp	Added PARSE_JSON_RESPONSE_QUERY macro for future JSON response testing with query parameters
test_package/websockets_rest_sink_test.cpp	Reformatted multi-line assertion for better readability

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