Preserve trailing newline in `TerminalOutput::full_text` (#38061)

ImFeH2 created

Closes #30678

This is caused by `TerminalOutput::full_text` triming trailing newline
when creating the "REPL Output" buffer.

Release Notes:

- fix: Preserve trailing newline in `TerminalOutput::full_text`

Change summary

crates/repl/src/outputs/plain.rs | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

Detailed changes