progress bars are always displayed, also on TERM=dumb

This leads to lots of noise in logs files in my tools, since I am running some progress bars on kubernetes clusters.

It would be great if ProgressBar would output either nothing or a line-by-line progress report (without using `\r`) when it cannot detect a terminal.

Look for terminal detection logic in the library, likely in a module handling TTY checks or environment variables like TERM. The issue is about suppressing or changing progress bar output when TERM=dumb. Find where the progress bar decides to use carriage returns (\r) for updates. Test by running a simple example with TERM=dumb set and see the current noisy output. The fix involves checking the TERM environment variable and either outputting line-by-line progress or nothing.

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