Support "quiet" verbosity in terminal logger #9654
Description
Summary
Respect "quiet" verbosity in the terminal logger by minimizing or eliminating persistent output lines (while preserving the "live" status display that is the point of TL).
Background and Motivation
Today, -tl disregards verbosity settings (for example -v:q), because there are many existing "high" priority build messages that don't seem, in retrospect, to be very high-priority. However, that means that there's also no way to reduce output from the terminal logger.
Proposed Feature
When verbosity is set to quiet, do not emit messages like "restore finished", the "primary output of the project" message, or "build finished".
Alternative Designs
No response