[promisemaduabuchi25-glitch]

Summary

• Expose --package as a discoverable alias for the repeatable --include workspace-package selector.
• Preserve the existing mutually exclusive --include/--exclude behavior and Cargo workspace filtering.
• Add a CLI regression test for the package alias.
• Document the package-selection capability in the unreleased changelog.

Validation

• git diff --check
• Recommended CI checks:
  • cargo fmt --check
  • cargo test -p soroban-testkit-cli
  • cargo test --workspace --doc

Closes #384

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