test(alias): cover remove config error JSON code

[overtrue]

Related issue(s)

None.

Background

Recent alias command error handling changed generic alias operation failures to emit JSON errors with explicit exit codes. Existing coverage exercises malformed RC_HOST validation and alias set validation, but alias remove did not have a subprocess regression for config-load failures.

Solution

Add a focused alias remove error-contract test that writes a malformed config.toml, runs rc alias remove stale --json, and verifies the command exits with code 1 while emitting stderr JSON that includes code: 1 and general_error metadata.

Validation

• cargo test -p rustfs-cli --test alias_config_error
• make pre-commit

[Copilot]

Pull request overview

Adds a new CLI contract test to ensure rc alias remove --json reports config-load failures as structured JSON errors with an explicit exit code, covering a previously untested regression path in alias removal.

Changes:

• Introduces a new error-contract test that writes an invalid config.toml and runs rc alias remove stale --json.
• Verifies the command exits with code 1 and emits JSON error metadata on stderr (code, details.type, details.retryable).

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