test(cli): cover cors parser alias and force

[overtrue]

Summary

Adds focused parser coverage for recent bucket CORS command surfaces.

The recent CORS command work supports both nested bucket commands and the deprecated top-level rc cors form. Existing tests covered several nested command paths, but they did not assert that the top-level get alias resolves to the list operation or that the CORS --force flag is preserved through nested list parsing.

This PR adds two narrow CLI parser tests in crates/cli/src/commands/mod.rs:

• rc cors get local/my-bucket maps to CorsCommands::List.
• rc bucket cors list local/my-bucket --force keeps force = true.

No runtime CORS behavior or S3 request code is changed.

Validation

• cargo fmt --all --check
• cargo test -p rustfs-cli cors
• cargo clippy --workspace -- -D warnings
• cargo test --workspace

Note: make pre-commit was requested, but this checkout has no Makefile and make reports No rule to make target pre-commit.