Relax upsert conflict violation rule from error to warning

[compulim]

Changelog Entry

Fixed

• Downgraded graph upsert conflict checks, by @compulim in PR #5674

Description

We have a strict checks for graph upserting conflicting changes. We are relaxing the check as a warning.

Design

Specific Changes

• Updated Graph.ts to relax the violation check
• Updated token server URL

• I have added tests and executed them locally
• I have updated CHANGELOG.md
• I have updated documentation

Review Checklist

This section is for contributors to review your work.

• Accessibility reviewed (tab order, content readability, alt text, color contrast)
• Browser and platform compatibilities reviewed
• CSS styles reviewed (minimal rules, no z-index)
• Documents reviewed (docs, samples, live demo)
• Internationalization reviewed (strings, unit formatting)
• package.json and package-lock.json reviewed
• Security reviewed (no data URIs, check for nonce leak)
• Tests reviewed (coverage, legitimacy)