Handle HTTPError from Seer API in autofix endpoint

[Copilot]

When Seer's IP is blocked by GitHub org allowlists, get_autofix_state() raises unhandled requests.HTTPError (403/500), bubbling to users as raw errors.

Changes

• Added requests.HTTPError handling in GroupAutofixEndpoint._get_legacy() and _get_explorer()
• Handlers log exceptions with context (group_id, organization_id, status_code) and return graceful 500 with error message
• Added test coverage for 403, 500, and null response scenarios

try:
    autofix_state = get_autofix_state(
        group_id=group.id,
        organization_id=group.organization.id,
        check_repo_access=check_repo_access,
        is_user_fetching=bool(is_user_watching),
    )
except requests.HTTPError as e:
    logger.exception(
        "group_ai_autofix.get.http_error",
        extra={
            "group_id": group.id,
            "organization_id": group.organization.id,
            "status_code": e.response.status_code if e.response is not None else None,
        },
    )
    return Response(
        {"detail": "Failed to fetch autofix state"},
        status=status.HTTP_500_INTERNAL_SERVER_ERROR,
    )

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