Read configuration outputs logs as well as configuration

When running `devcontainer read-configuration --include-merged-configuration --log-format json --workspace-folder ../workspace 2>/dev/null > server/configuration.json` as suggested in the example usage folder, it outputs logs in json format, then at the end, the JSON configuration. Similarly if I remove `--log-format json` .

Example output:
```json
{"type":"text","level":3,"timestamp":1724085707436,"text":"@devcontainers/cli 0.65.0. Node.js v20.14.0. darwin 24.1.0 arm64."}
{"type":"start","level":2,"timestamp":1724085707436,"text":"Run: git rev-parse --show-cdup"}
{"type":"stop","level":2,"timestamp":1724085707448,"text":"Run: git rev-parse --show-cdup","startTimestamp":1724085707436}
{"type":"start","level":2,"timestamp":1724085707449,"text":"Run: docker ps -q -a --filter label=devcontainer.local_folder=/DEVCONTAINER_CLI_PATH/workspace/.devcontainer/devcontainer.json"}
{"type":"stop","level":2,"timestamp":1724085707476,"text":"Run: docker ps -q -a --filter label=devcontainer.local_folder=/DEVCONTAINER_CLI_PATH/workspace/.devcontainer/devcontainer.json","startTimestamp":1724085707449}
{"type":"start","level":2,"timestamp":1724085707476,"text":"Run: docker inspect --type container a183f5305ed0"}
{"type":"stop","level":2,"timestamp":1724085707503,"text":"Run: docker inspect --type container a183f5305ed0","startTimestamp":1724085707476}
{"configuration":{"name":"devcontainer CLI Demo","build":{"dockerfile":"Dockerfile"},"customizations":{"vscode":{"extensions":["streetsidesoftware.code-spell-checker","mutantdino.resourcemonitor"],"settings":{"resmon.show.battery":false,"resmon.show.cpufreq":false}},"openvscodeserver":{"extensions":["streetsidesoftware.code-spell-checker"],"settings":{}}},"features":{"ghcr.io/devcontainers/features/go:1":{"version":"1.18.4"},"ghcr.io/devcontainers/features/node:1":{"version":"16.15.1","nodeGypDependencies":false},"ghcr.io/devcontainers/features/desktop-lite:1":{},"ghcr.io/devcontainers/features/docker-in-docker:2":{},"ghcr.io/devcontainers/features/sshd:1":{}},"appPort":["127.0.0.1:2222:2222",8000,6080],"remoteUser":"vscode","configFilePath":{"$mid":1,"fsPath":"/Users/tjs/Documents/.coding/open-source-repl/data/templates/workspace/.devcontainer/devcontainer.json","path":"/Users/tjs/Documents/.coding/open-source-repl/data/templates/workspace/.devcontainer/devcontainer.json","scheme":"vscode-fileHost"}},"workspace":{"workspaceFolder":"/workspaces/.coding/open-source-repl/data/templates/workspace","workspaceMount":"type=bind,source=/Users/tjs/Documents/.coding,target=/workspaces/.coding,consistency=consistent"},"mergedConfiguration":{"name":"devcontainer CLI Demo","build":{"dockerfile":"Dockerfile"},"features":{"ghcr.io/devcontainers/features/go:1":{"version":"1.18.4"},"ghcr.io/devcontainers/features/node:1":{"version":"16.15.1","nodeGypDependencies":false},"ghcr.io/devcontainers/features/desktop-lite:1":{},"ghcr.io/devcontainers/features/docker-in-docker:2":{},"ghcr.io/devcontainers/features/sshd:1":{}},"appPort":["127.0.0.1:2222:2222",8000,6080],"remoteUser":"vscode","configFilePath":{"$mid":1,"fsPath":"/Users/tjs/Documents/.coding/open-source-repl/data/templates/workspace/.devcontainer/devcontainer.json","path":"/Users/tjs/Documents/.coding/open-source-repl/data/templates/workspace/.devcontainer/devcontainer.json","scheme":"vscode-fileHost"},"init":true,"privileged":true,"capAdd":["SYS_PTRACE"],"securityOpt":["seccomp=unconfined"],"entrypoints":["/usr/local/share/desktop-init.sh","/usr/local/share/docker-init.sh","/usr/local/share/ssh-init.sh"],"mounts":[{"source":"dind-var-lib-docker-1r24dt41uav7vdhklt8d2bd3dnr3h8f1hftte0fss9ufcg2rom8j","target":"/var/lib/docker","type":"volume"}],"customizations":{"vscode":[{"extensions":["ms-azuretools.vscode-docker"]},{"extensions":["golang.Go"]},{"extensions":["dbaeumer.vscode-eslint"]},{"extensions":["streetsidesoftware.code-spell-checker","mutantdino.resourcemonitor"],"settings":{"resmon.show.battery":false,"resmon.show.cpufreq":false}}],"openvscodeserver":[{"extensions":["streetsidesoftware.code-spell-checker"],"settings":{}}]},"onCreateCommands":[],"updateContentCommands":[],"postCreateCommands":[],"postStartCommands":[],"postAttachCommands":[],"remoteEnv":{},"containerEnv":{},"portsAttributes":{}}}

```

Start by reproducing the `devcontainer read-configuration --include-merged-configuration --log-format json` command from the example usage, including its redirected output, then trace the read-configuration CLI entry point and its output handling. Confirm whether logs and configuration are intentionally combined, and define completion as output that matches the command's documented example without the reported ambiguity.

Written by the indexing model from the issue text.