Show build and install summaries in uv run and uv tool run

[charliermarsh]

Summary

Initially, we showed all resolver and installer output in uv run and uv tool run, since it was way too much for workhorse commands. Then, we moved to showing no output by default, which was way too little -- you had no idea why anything was happening, and commands appeared to hang.

This PR adds a more nuanced middle-ground. With --verbose, we continue to show everything. But by default, in uv run and uv tool run...

• During resolution, we show any "Building" and "Build" messages, if you need to build a source distribution. But we don't show any other output. (This could be too little for expensive resolutions; we may want to show a spinner.)
• If there are no changes to be made after resolving, we don't show any other output.
• If we have to install, we show the progress bars for downloads (which disappear on completion) followed by a single summary line stating the number of packages installed.

This feels pretty good, in my limited testing. When everything is built / cached, you don't get any additional output. When there's work to do, you have a sense for what's happening, and we leave you with a single summary line ("Installed X packages") at the end.

Closes #5758.

Test Plan

Notice that the first tool run ends with an install line; the second shows no additional output:

If you run uv run in a package for the first time, we do tell you that we're building / built it:

But on the second run, there's no output:

If you add a --with, we'll show you all the installer progress bars (which disappear once they're done), and then a single summary line:

[konstin]

Love it!