cp: --no-clobber --progress produces progress even if copy didn't happen because of target presence

Tool: cp.
Version: commit c8bcdb926 (latest in main as of 2024-12-06).

STR:

1. echo 'a' > a && cp --no-clobber --progress -v -T -- a b emits 1 line into stdout and 1 line into stderr as expected:
   1.a. 'a' -> 'b'
   1.b. cp: [00:00:00] █████████ 2 B/2 B
2. Run cp --no-clobber --progress -v -T -- a b one more time.

Actual:

1. This time tool emits nothing into stdout. It completely matches the expectation.
2. It still emits progress into stderr like cp: [00:00:00] █████████ 2 B/2 B even though no copy happened.

Expected:

1. Absolutely no output.

Start with the Rust implementation of the cp command and reproduce the two-step --no-clobber --progress -v -T command from the issue. Trace how an existing target is handled alongside progress reporting. Done means the second invocation emits no stdout or stderr when no copy occurs.