chore: re-add default campaign views/fields setup

[Copilot]

PR #12638 removed the campaign command but deleted useful project setup logic. This restores campaign view and custom field creation as a single flag on project new.

Changes

New flag on gh aw project new:

• --with-campaign-setup - Creates views, custom fields, and enhanced Status field

Implementation:

• Adapted campaign view/field creation from deleted pkg/campaign/project.go
• Uses GraphQL API for Status field manipulation (inserts "Review Required" before "Done")
• Handles both org and user projects via GitHub REST and CLI APIs

Usage:

# Full campaign setup
gh aw project new "Q1 Campaign" --owner myorg --with-campaign-setup

Technical Notes

• ensureSingleSelectOptionBefore() appends to end if anchor option doesn't exist (documented)
• Type assertions validated with proper error handling on project creation response
• View creation uses REST API; field creation uses gh project field-create

Original prompt

From this PR: #12638
Bring back our standard campaign view + custom fields and integrated it into project cmd logic.

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[mnkiefer]

@copilot No need for granular control (--views, --fields).

[Copilot]

@copilot No need for granular control (--views, --fields).

Removed the --views and --fields flags. Now only --with-campaign-setup is available for creating projects with campaign views and custom fields. (7d3d5df)