chore: Update copilot-usage action to v3.0 and action-send-mail to v3.0

Merge pull request austenstone#20 from austenstone/dependabot/github_…

…actions/ossf/scorecard-action-2.3.3

chore(deps): Bump ossf/scorecard-action from 2.3.1 to 2.3.3

Update README.md

Refactor job.summary.ts to include Copilot seat assignments and updat…

…e CI workflow

Update organization field in copilot-usage action to use repository o…

…wner dynamically

Refactor Copilot Usage Action to include job summary and improve code…

… readability