Global config file can be truncated if process is interrupted during write

[MarkArbogast]

Describe the bug

The global config file (~/.vmware-aria-operations-integration-sdk/config.json) is updated with a read-then-write pattern: the file is opened for writing (which truncates it) and then the new contents are written. If the process is interrupted (e.g. Ctrl-C) after the file is truncated but before the write finishes, the config file can be left empty or partially written. That can cause commands like mp-build to fail until the config is restored or recreated.

We should be able to address this by writing to a temp file and atomically replacing the original.

Reproduction steps

1. Run mp-build
2. Cancel during the config file re-write

Expected behavior

Config file should be preserved

Additional context

No response

[MarkArbogast]

Also, an empty config file should not cause mp-init or other commands to break