fix: correct finishReason in Google streaming#109

suhaibbinyounis merged 2 commits into

mainsuhaibbinyounis/github-copilot-api-vscode:mainfrom

fix/100-google-streaming-finish-reasonsuhaibbinyounis/github-copilot-api-vscode:fix/100-google-streaming-finish-reasonCopy head branch name to clipboard