Reconfigure stdout to be line-buffered in quickrun

[dwhswenson]

It looks like we're having an issue that, if a job is killed by a queueing system, some of the buffered output might not get written to the job's output file. This should force the buffer to flush on newline, which can hopefully solve some user confusion.

I considered putting this in the CLI main, but decided the one-liner can go in specific commands that need it. It should only be needed for commands that will be long-running (on a cluster).

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (9e6766e) 91.99% compared to head (62b1a83) 92.00%.

❗ Current head 62b1a83 differs from pull request most recent head 9e39664. Consider uploading reports for the commit 9e39664 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #468   +/-   ##
=======================================
  Coverage   91.99%   92.00%           
=======================================
  Files         106      106           
  Lines        6324     6326    +2     
=======================================
+ Hits         5818     5820    +2     
  Misses        506      506           

Impacted Files	Coverage Δ
openfecli/commands/quickrun.py	100.00% <100.00%> (ø)

☔ View full report in Codecov by Sentry.
📢 Do you have feedback about the report comment? Let us know in this issue.

[dwhswenson]

@mikemhenry : Could you check if this does, in fact, solve the problem? I was thinking you could use something like the shorten_runs.py script to make units shorter, then set some even-shorter wall time. Rather than running this code, you could also make a test run like that and compare with PYTHONUNBUFFERED unset and set: ideally, you can regularly reproduce when unset, and never reproduce when it is set!

[mikemhenry]

Reference here: https://docs.python.org/3/library/io.html#io.TextIOWrapper (I was trying to understand how setting something abut buffering to True would reduce buffering, but it flushes the buffer on \n)

[mikemhenry]

RE: testing

I will have to make a script that does something like sleep and print in a loop because it looks like dumping all the debug stuff has made everything show me the progress as I look at it