Unicron implemented rest fallback when graphql fails prod

[lukaszgryglicki]

cc @mlehotskylf @ahmedomosanya @jarias-lfx

Requested REST API fallback when GraphQL fails due to permissions.

Signed-off-by: Lukasz Gryglicki lgryglicki@cncf.io

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Pull Request Overview

This PR implements a REST API fallback mechanism when GraphQL operations fail due to permissions issues, providing more robust handling of GitHub API limitations.

• Adds REST fallback logic in both Python and Go implementations when GraphQL fails
• Changes error handling from silent returns to explicit exceptions to trigger fallback
• Implements complete REST-based commit author processing with co-author support

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
cla-backend/cla/models/github_models.py	Updates GraphQL error handling to raise exceptions and implements comprehensive REST fallback with dual-path processing
cla-backend-go/github/github_repository.go	Adds new REST-based commit processing function and integrates fallback mechanism into existing GraphQL workflow

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