Improve allocations from `JsonResultFormatter` #354

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3 errors and 4 warnings

Process completed with exit code 1.

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2, actions/upload-artifact@v2. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

No files were found with the provided path: ./output/coverage/*.xml. No artifacts will be uploaded.

No files were found with the provided path: **/__mismatch__/*. No artifacts will be uploaded.

No files were found with the provided path: ./output/test-results/*.trx. No artifacts will be uploaded.