fix: Fix local datafusion-cli test failure

[2010YOUY01]

Which issue does this PR close?

• Closes #.

Rationale for this change

One test case in datafusion-cli crate is failing locally if you run all tests through cargo nextest run, but passes for cargo test

        FAIL [   0.375s] datafusion-cli::cli_integration cli_explain_environment_overrides

The reason is nextest triggers a different build graph, which enforces a feature flag in serde_json dependency.

This PR enforces this feature in the dev-dependencies in datafusion-cli crate, so the test become deterministic under different test setup.

#21502 Fixed a similar issue, and also explains why not enabling it in the global dependencies inside Cargo.toml

What changes are included in this PR?

Are these changes tested?

Are there any user-facing changes?