fix: handle network errors in computePreferredOrganizationName (fixes #319001)#319009

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mainmicrosoft/vscode:mainfrom

fix/copilot-fetch-failed-319001-b514c695fbe1d9dcmicrosoft/vscode:fix/copilot-fetch-failed-319001-b514c695fbe1d9dcCopy head branch name to clipboard