fix(auth): validate service names in auth login --services flag

[nuthalapativarun]

Summary

auth login --services driev (typo) silently dropped the unknown name and proceeded with an empty scope list, resulting in a useless login without any error message.

This change adds validate_service_names() which runs before the OAuth flow starts and returns a clear Validation error listing both the unknown service names and all valid aliases. The --services help text is also updated to document that unknown names are rejected.

Fixes #741

Changes

• Added validate_service_names() helper that checks each name in the filter against all known aliases from crate::services::SERVICES
• Called the validator in handle_login_inner() before any OAuth or credential work begins
• Updated --services help text to document the valid names and that typos are rejected
• Replaced the old resolve_scopes_services_filter_unknown_service_ignored test (which documented the broken behavior) with four new tests covering: typo rejection, known names, multi-alias names, and empty set

Checklist

• cargo fmt --all (CI will verify — no local Rust toolchain on this machine)
• cargo clippy -- -D warnings (CI will verify)
• cargo test (CI will verify)
• Regression tests added
• Changeset file added (patch bump)

[changeset-bot]

🦋 Changeset detected

Latest commit: 3423a47

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@googleworkspace/cli	Patch

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[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request improves the robustness of the auth login --services command by introducing strict validation for service names. By catching typos and invalid inputs early, the CLI now provides immediate, actionable feedback to users instead of proceeding with an incorrect or empty scope configuration.

Highlights

• Input Validation: Implemented a new validate_service_names helper function to verify service names against known aliases before initiating the OAuth flow.
• Improved Error Handling: Replaced silent failures for unknown service names with descriptive validation errors that include a list of valid options.
• Documentation Update: Updated the --services flag help text to clearly communicate that unknown service names will be rejected.
• Test Coverage: Replaced outdated tests with a comprehensive suite covering typo rejection, valid inputs, multi-alias support, and empty sets.

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[gemini-code-assist]

Code Review

This pull request introduces validation for service names passed to the auth login --services command. It updates the CLI help text to list valid service names, adds a validate_service_names function to check for unknown aliases, and integrates this validation early in the login flow to return clear errors. Additionally, unit tests have been added to verify this validation behavior. There are no review comments, so I have no feedback to provide.