chore: set cli pwd warning go to stderr

[hamidzr]

Ticket

Description

we'd probably want a shared path for all cli warnings. we have deprecation warnings and probably other warning classes as well

or maybe use https://docs.python.org/3/library/exceptions.html#UserWarning ?

Test Plan

det u logout; det e ls > /dev/null

Checklist

• Changes have been manually QA'd
• New features have been approved by the corresponding PM
• User-facing API changes have the "User-facing API Change" label
• Release notes have been added as a separate file under docs/release-notes/
  See Release Note for details.
• Licenses have been included for new code which was copied and/or modified from any external code

[netlify]

✅ Deploy Preview for determined-ui canceled.

Name	Link
🔨 Latest commit	4155b1f
🔍 Latest deploy log	https://app.netlify.com/sites/determined-ui/deploys/668c32874af1ec0008392fa9

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 52.88%. Comparing base (3f7cad6) to head (4155b1f).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #9536   +/-   ##
=======================================
  Coverage   52.88%   52.88%           
=======================================
  Files        1255     1255           
  Lines      153086   153089    +3     
  Branches     3230     3230           
=======================================
+ Hits        80958    80967    +9     
+ Misses      71977    71971    -6     
  Partials      151      151           

Flag	Coverage Δ
backend	44.00% <ø> (+0.01%)	⬆️
harness	72.77% <80.00%> (+<0.01%)	⬆️
web	51.30% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
harness/determined/common/api/authentication.py	87.50% <100.00%> (+0.12%)	⬆️
harness/determined/cli/user.py	53.23% <0.00%> (ø)

... and 3 files with indirect coverage changes

[azhou-determined]

👍