test(cli): cover noun-first list aliases

[overtrue]

Summary

This adds focused parser coverage for the noun-first ls aliases introduced with the recent bucket/object command groups.

Problem

The command-group work in #76 added bucket and object entrypoints with ls as an alias for list, but the parser tests in crates/cli/src/commands/mod.rs did not assert those alias routes. That left a small regression window where the alias wiring could drift without a fast unit test catching it.

Root cause

Existing parser coverage around the noun-first surface focused on bucket cors and other follow-up gaps, but not on the ls aliases attached directly to BucketCommands::List and ObjectCommands::List.

Fix

The patch keeps scope tight to crates/cli/src/commands/mod.rs:

• add cli_accepts_bucket_list_alias for rc bucket ls local/
• add cli_accepts_object_list_alias for rc object ls local/my-bucket/logs/

Both assertions verify clap dispatch reaches the expected noun-first command variants and preserves the parsed path.

Validation

I ran:

• cargo test -p rustfs-cli cli_accepts_bucket_list_alias --lib -- --nocapture
• cargo test -p rustfs-cli cli_accepts_object_list_alias --lib -- --nocapture
• cargo fmt --all --check
• cargo clippy --workspace -- -D warnings
• cargo test --workspace

I also ran make pre-commit per the automation instructions, but this checkout does not define that target:

make: *** No rule to make target `pre-commit'.  Stop.