Revert "make sui CLI log file gated by env flag (#12095)"

[amnn]

Description

This reverts commit 8ff1005.

Following the previous fix, logs were showing up in terminal output even when RUST_LOG was not enabled.

Test Plan

sui$ cargo build --bin sui
sui$ ./target/debug/sui client active-address
sui/crates/sui$ cargo nextest run 

---

If your changes are not user-facing and not a breaking change, you can skip the following section. Otherwise, please indicate what changed, and then add to the Release Notes section as highlighted during the release process.

Type of Change (Check all that apply)

• protocol change
• user-visible impact
• breaking change for a client SDKs
• breaking change for FNs (FN binary must upgrade)
• breaking change for validators or node operators (must upgrade binaries)
• breaking change for on-chain data layout
• necessitate either a data wipe or data migration

Release notes

Revert behaviour where log output was controlled by an env flag, because when it was gated off, logs started showing up in command-line output. CLI now behaves as it did before: Producing a log file in the current working directory, but not displaying logs in line under normal operation.

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[dustin6341]

crates/sui/src/main.rs

[dustin6341]

crates/sui/src/main.rs