Add wizard should support adding workflows without requiring a PR

[mnkiefer]

When installing an Agentic Workflow bundle or multiple of them, for example:
gh aw add-wizard githubnext/central-agentic-ops/dependabot

The gh aw cli should allow the workflows to be written without requiring a PR.
Current behavior is that if we cancel on this step, no workflow files are written at all (locally):

The following workflow files will be added:
  • .github/workflows/dependabot.md
  • .github/workflows/dependabot.lock.yml

i This workflow runs on a schedule.

The repository will also be initialized with:
  • .gitattributes
  • .vscode/settings.json
  • .github/skills/agentic-workflows/SKILL.md
  • .github/agents/agentic-workflows.md
  • .github/mcp.json
  • .github/workflows/copilot-setup-steps.yml

┃ Do you want to proceed with these changes?
┃ A pull request will be created with the workflow files
┃
┃        Yes, create pull request     No, cancel  

While it should have added files dependabot.md and dependabot.lock.yml without raising a PR.