fix: fix compile err in release build of risectl

[wenym1]

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What's changed and what's your intention?

As titled.

The compile error is introduced in #15365. Previously we use cargo build --bin risectl to build risectl without specifying the crate via -p risingwave_cmd, which makes cargo use the union of features used in all crates in the workspace. risingwave_simulation enables enable_test_epoch in its dependency list rather than in the dev dependency, which makes the feature union includes the enable_test_epoch by accidence. In this PR, by specifying the crate via -p risingwave_cmd, the feature enabled in risingwave_simulation will not be included in the future union, and then the enable_test_epoch will not be enabled when building risectl.

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[huangjw806]

LGTM!