deps: update heroku-cli/command to v13.0.0-beta.1

[erika-wallace]

Summary

This PR upgrades @heroku-cli/command to version 13.0.0-beta.1, which includes the new credential manager integration.

Changes

• Overrides @heroku-cli/command in package.json so every dependency resolves to the same version
• Stubs the credential manager via setCredentialManagerProvider so tests don't interact with the real OS
• Adds init() before run() in run-command.ts and runCommand.ts so tests load auth before the command body runs

Type of Change

Breaking Changes (major semver update)

• Add a ! after your change type to denote a change that breaks current behavior

Feature Additions (minor semver update)

• feat: Introduces a new feature to the codebase

Patch Updates (patch semver update)

• fix: Bug fix
• deps: Dependency upgrade
• revert: Revert a previous commit
• chore: Change that does not affect production code
• refactor: Refactoring existing code without changing behavior
• test: Add/update/remove tests

Testing

Notes:

Steps:

1. Passing CI suffices.

Screenshots (if applicable)

Related Issues

GUS work item: W-20826883

[tlowrimore-heroku]

Looks great!