Enable JSON tests in ManualTests project

[paulmedynski]

Enable the JSON integration tests. These tests appear to be gated by the DataTestUtility.IsJsonSupported flag, which is also listed in the config.default.json file under "isJsonSupported": false key.

Wait for #3429 to be merged, and see if Copilot can figure this out.

[cheenamalhotra]

Instructions for copilot:

• Update the files in the eng\ folder for all pipelines.
• Enable 'IsJsonSupported' to be set to 'true' where the configuration name contains 'Azure SQL'.
• Prepare PR with the changes.