cli: fix port forward responses getting truncated (#206466)

There was a bug in the compression loop where the compressor could
indicate that it processed all input, but was waiting for space in the
output buffer in order to send the data We didn't handle this case so
data would just get stuck in the buffer and dropped when the connection
closed.

A fix with more tweaks is found in #206464, but this change is
sufficient to resolve the issue for me.

Refs microsoft/vscode-remote-release#9594

Author: connor4312

cli/src/tunnels/socket_signal.rs

@@ -255,7 +255,7 @@ where
 				Ok(flate2::Status::Ok | flate2::Status::BufError) => {
 					let processed_len = in_offset + (self.flate.total_in() - in_before) as usize;
 					let output_len = out_offset + (self.flate.total_out() - out_before) as usize;
-					if processed_len < contents.len() {
+					if processed_len < contents.len() || output_len == self.output.len() {
 						// If we filled the output buffer but there's more data to compress,
 						// extend the output buffer and keep compressing.
 						out_offset = output_len;