chore: 更新 .cnb.yml 镜像构建任务配置，统一镜像标签格式为 firefox-latest-linux-amd64/firefox-latest-linux-arm64 和 chromium-latest-linux-amd64/chromium-latest-linux-arm64，替换镜像仓库导入源，并添加多架构 manifest 构建流程
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