fix(chown,chgrp): print --verbose success lines to stdout

[l46983284-cpu]

Summary

chown/chgrp --verbose was printing successful changed/retained lines to stderr with a chown:/chgrp: prefix because report_ownership_change_success and the wrap_chown Ok path used show_error!.

GNU prints those informational lines to stdout with no util-name prefix. This PR routes success-path verbose/changes output through println! and leaves real errors on stderr.

Changes

• src/uucore/src/lib/features/perms.rs: success verbose/changes → stdout
• tests/by-util/test_chown.rs, tests/by-util/test_chgrp.rs: assert retained/changed lines on stdout

Test plan

• CI test_chown / test_chgrp
• Manual: chgrp --verbose "$(id -gn)" file >out 2>err → line in out, empty err, no chgrp: prefix

Fixes #13408

[codspeed-hq]

Merging this PR will not alter performance

✅ 339 untouched benchmarks
⏩ 46 skipped benchmarks¹

---

_{Comparing l46983284-cpu:fix/chown-chgrp-verbose-stdout-gnu-compat (d97fdbd) with main (b40aaf6)}

Footnotes

1. 46 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/cut/bounded-memory (fails in this run but passes in the 'main' branch)
Skip an intermittent issue tests/tail/tail-n0f (fails in this run but passes in the 'main' branch)
Skipping an intermittent issue tests/date/date-locale-hour (passes in this run but fails in the 'main' branch)
Skipping an intermittent issue tests/date/resolution (passes in this run but fails in the 'main' branch)
Skipping an intermittent issue tests/tail/retry (passes in this run but fails in the 'main' branch)
Skipping an intermittent issue tests/timeout/timeout-group (passes in this run but fails in the 'main' branch)
Note: The gnu test tests/rm/many-dir-entries-vs-OOM is now being skipped but was previously passing.
Note: The gnu test tests/seq/seq-epipe is now being skipped but was previously passing.

[cakebaker]

I would use writeln! instead of println!, otherwise the example from #13408 will panic:

$ cargo run --features=unix -q chgrp --verbose "$(id -gn)" "$tmp/f" > /dev/full ; echo "exit=$?"
chgrp: cannot dereference '/f': No such file or directory

thread 'main' (79884) panicked at /rustc/2d8144b7880597b6e6d3dfd63a9a9efae3f533d3/library/std/src/io/stdio.rs:1166:9:
failed printing to stdout: No space left on device (os error 28)
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
exit=101

[l46983284-cpu]

Thanks — switched the verbose success path to writeln! so a full/closed stdout reports a write error instead of panicking on println!.

Pushed as a small helper in perms.rs; focused cargo check / clippy on uu_chown + uu_chgrp are green.

[l46983284-cpu]

Rebased onto current main.

main already landed the /dev/full non-panic write-error path (058a2a6). This branch now only finishes the remaining GNU gap from #13408: successful --verbose / --changes retained/changed lines go through write_verbose_line (stdout) instead of show_error! (stderr + util-name prefix).

Local: test_chown 33/33 and test_chgrp 31/31 under --features unix.

[l46983284-cpu]

Pushed a small residual fix for the recursive path. After routing verbose retained lines to stdout, the root traverse was returning early and never visited children under -R, which is why CI only saw ownership of 'a'/'z'. The root arm now writes the line and continues into dive, and the recursive test needles match path.quote() single quotes again.

Local: test_chown::test_chown_recursive + test_chown_symlink_cycles PASS; full test_chown:: was 33/33 earlier.

[cakebaker]

Thanks for your PR!