feat: Improve onError Handling in Atoms: Surface API Error Messages for Toast Notifications

[weknowyourgame]

• Fixes #21248
• Fixes CAL-5751

Mandatory Tasks (DO NOT REMOVE)

• [x] I have self-reviewed the code (A decent size PR without self-review might be rejected).
• [x] I have updated the developer docs in /docs if this PR makes changes that would require a documentation change. If N/A, write N/A here and check the checkbox.
• [x] I confirm automated tests are in place that prove my fix is effective or that my feature works.

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Summary by cubic

Improved error handling in Atoms to show detailed API error messages in toast notifications instead of generic errors.

• Bug Fixes
  • Updated all onError handlers to use a new getErrorMessage utility for clearer user feedback.

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Graphite Automations

"Add consumer team as reviewer" took an action on this PR • (06/13/25)

1 reviewer was added to this PR based on Keith Williams's automation.

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1 label was added to this PR based on Keith Williams's automation.

[weknowyourgame]

Hey @SomayChauhan from what i understood from the review I implemented a global interceptor handle API error toasts. Please let me know what you think.

[github-actions[bot]]

This PR is being marked as stale due to inactivity.