feat(packages/sui-mono): add --skip-checks flag to release command

[tomasmax]

Description

Adds a new --skip-checks flag to sui-mono release that appends a skip-checks: true trailer to release commit messages. This allows skipping GitHub branch protection check runs for individual release commits.

Also documents the existing (previously undocumented) --skip-ci flag in the README.

See: https://docs.github.com/es/enterprise-server@3.19/pull-requests/collaborating-with-pull-requests/collaborating-on-repositories-with-code-quality-features/about-status-checks#skipping-and-requesting-checks-for-individual-commits

Related Issue

N/A

Example

# Skip GitHub check runs for release commits
sui-mono release --skip-checks

# Can be combined with --skip-ci
sui-mono release --skip-ci --skip-checks

# Full CI usage
npx @s-ui/mono release --github-user $GITHUB_USER --github-email $GITHUB_EMAIL --github-token $GITHUB_TOKEN --lock --skip-checks