Change unit test in HighwayServerCodecFilterTest to deterministic implementation

[anthonyx24]

Issue: See #4987.

Fix: The fix here is the same as previously merged PRs such as #4969 and #4971. I use JSONAssert's assertEquals() method, using non-strict checking (which ignores parameter ordering). This compares the JSON strings without enforcing parameter ordering, which removes the potentially unreliable nature of these tests. This library is already included within in the project, so there's no need to update the pom file. Rerunning Nondex shows a passing result.

PR Checklist:

• Github Issue: [BUG] - Nondeterminism in unit test within HighwayServerCodecFilterTest due to JSON parameter ordering #4987
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[SweetWuXiaoMei]

lgtm