CLI: write logstream to memory

[yannbf]

This is a possible, nice to have followup of #22554
Currently, the log stream when running npm install as part of storybook init is written directly to the hard drive. Users would be thankful if this operation could be avoided to avoid multiple write operations to the hard drive in a short period of time.

Instead, should we consider writing into memory instead, until the file is finally written? This has several benefits:

1. Write operations to the hard drive are slow in comparison to the memory
2. There is no need to clear the temporary file if error logs are not written to the hard drive; just clear the memory.
3. Reading from the temporary file can be avoided completely because we don't need it anymore

Let's just write to the hard drive, when it is necessary (producing the final log file), otherwise, let's avoid it as far as possible.

Originally posted by @valentinpalkovic in #22554 (comment)