test: avoid flaky run wait in debugger restart test

[inoway46]

Summary

Follow-up to #61773

test/parallel/test-debugger-run-after-quit-restart.js can still flake on macOS unusual-path runs around run.
stepCommand('run') expects a break message immediately, but run may return ok/prompt before the break output.
This change switches those calls to command('run') and keeps waitForInitialBreak() for the actual break sync.

failed CI logs:

• https://github.com/nodejs/node/actions/runs/22647161362 (line:44)
• https://github.com/nodejs/node/actions/runs/22158756428 (line:74)

Testing

UNUSUAL="$HOME/dir with \$unusual\"chars?'åß∂ƒ©∆¬…\`"
mkdir -p "$UNUSUAL"
ln -sfn "$PWD" "$UNUSUAL/node"
cd "$UNUSUAL/node"

• ./tools/test.py -p actions parallel/test-debugger-run-after-quit-restart
• ./tools/test.py -p actions -j1 --repeat 50 parallel/test-debugger-run-after-quit-restart
• ./tools/test.py -p actions -j1 --repeat 50 parallel/test-debugger-run-after-quit-restart (unusual path)

Refs: #61762

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.65%. Comparing base (1647288) to head (52103c6).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #62112   +/-   ##
=======================================
  Coverage   89.64%   89.65%           
=======================================
  Files         676      676           
  Lines      206330   206330           
  Branches    39518    39517    -1     
=======================================
+ Hits       184973   184977    +4     
+ Misses      13480    13475    -5     
- Partials     7877     7878    +1     

see 26 files with indirect coverage changes

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[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/71586/