Avoid long stdout lines being truncated in Erlang tests

Summary:
# Context
We recently change the way Erlang tests run, so that the test-executor node running the CT suite has its stdout piped to the test-binary node, who logs for later processing

The port opened on the test-binary is using the `{line, N.}` option, which means that lines of size at most `N` are sent in a single `{eol, L}` message, but longer lines are split in one or more `{noeol, Ln}`, and a final `{eol, L}`.

# Problem
The logic handling messages from the port is only handling `{eol, L}` messages, so we'd be missing the prefix of very long lines.

In practice, N = 1Kb, so in practice this had little impact

# This diff
Handle the `noeol` message as well

Reviewed By: michalmuskala

Differential Revision: D88007158

fbshipit-source-id: 1584edbd9bbd9b374cd3f3f6cbf2c8b4d3d3ef5c

Author: jcpetruzza

prelude/erlang/common_test/test_exec/src/ct_runner.erl

@@ -155,10 +155,14 @@ handle_info(
             test_runner:mark_failure(ErrorMsg)
     end,
     {stop, {ct_run_finished, ExitStatus}, State};
-handle_info({_Port, {data, {eol, Data}}}, State) ->
+handle_info({Port, {data, {eol, Data}}}, State = #{port := Port}) ->
     Handle = maps:get(stdout_file_handle, State),
     file:write(Handle, [Data, "\n"]),
     {noreply, State};
+handle_info({Port, {data, {noeol, Data}}}, State = #{port := Port}) ->
+    Handle = maps:get(stdout_file_handle, State),
+    file:write(Handle, Data),
+    {noreply, State};
 handle_info({Port, closed}, #{port := Port} = State) ->
     {stop, ct_port_closed, State};
 handle_info({'EXIT', Port, Reason}, #{port := Port} = State) ->