feat(cli-hooks): output node warnings to stderr for debugging outputs

[zimeg]

Summary

This PR reverts changes made in #2096 that hide Node warnings.

The latest Slack CLI version v2.33.0 has improved handling of stderr and will now write unexpected output to debug logs instead of erroring when parsing hook responses! 🎉

Preview

node_warnings.mov

Reviewers

With these changes checked out and installed to an app using @slack/cli-hooks, run the following commands with Node v23.2.0:

$ slack manifest     # Get an app manifest
$ slack manifest -v  # Review debug logs

Requirements

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.94%. Comparing base (15e1ce0) to head (fb40920).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2152      +/-   ##
==========================================
- Coverage   91.94%   91.94%   -0.01%     
==========================================
  Files          38       38              
  Lines       10330    10328       -2     
  Branches      652      652              
==========================================
- Hits         9498     9496       -2     
  Misses        820      820              
  Partials       12       12              

Flag	Coverage Δ
cli-hooks	95.23% <100.00%> (-0.02%)	⬇️
cli-test	94.76% <ø> (ø)
oauth	77.39% <ø> (ø)
socket-mode	61.82% <ø> (ø)
web-api	96.88% <ø> (ø)
webhook	96.65% <ø> (ø)

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

[mwbrooks]

✅ LGTM!

🚀 Let's publish a release of this on Monday!

[zimeg]

@mwbrooks Thanks so much! I must've been following a different calendar, but am excited to be outputting warnings that do appear 👻