src: use Maybe<void> in ProcessEmitWarningSync

[daeyeon]

This patch uses Maybe<void> in the function where only the success result seems needed.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 90.24%. Comparing base (5ac9551) to head (b15000b).
Report is 28 commits behind head on main.

Files with missing lines	Patch %	Lines
src/node_process_events.cc	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #57250      +/-   ##
==========================================
- Coverage   90.24%   90.24%   -0.01%     
==========================================
  Files         630      630              
  Lines      184920   184920              
  Branches    36198    36182      -16     
==========================================
- Hits       166884   166883       -1     
- Misses      11059    11061       +2     
+ Partials     6977     6976       -1     

Files with missing lines	Coverage Δ
src/node_process.h	25.00% <ø> (ø)
src/node_process_events.cc	59.09% <50.00%> (ø)

... and 23 files with indirect coverage changes

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[daeyeon]

09:50:29 ../src/node_process_events.cc: In function 'v8::Maybe<void> node::ProcessEmitWarningSync(Environment*, std::string_view)':
09:50:29 ../src/node_process_events.cc:32:25: error: could not convert 'v8::Nothing<bool>()' from 'Maybe<bool>' to 'Maybe<void>'
09:50:29    32 |     return Nothing<bool>();
09:50:29       |            ~~~~~~~~~~~~~^~
09:50:29       |                         |
09:50:29       |                         Maybe<bool>

Jenkins failed because of merge conflicts from the 7c910d0. Rebased.

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/65604/

[daeyeon]

@targos @jasnell I've updated the code to fix the merge conflict. PTAL.

[nodejs-github-bot]

Landed in 117c1ca