debugger: fix behavior of plain object exec in debugger repl

[dario-piotrowicz]

Fixes: #46808

(PS: this is a continuation of #46924 which has been stale for almost a year at this point)

[anonrig]

LGTM with a small perf improvement.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.22%. Comparing base (824c6a5) to head (0804e77).
Report is 12 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #57498      +/-   ##
==========================================
- Coverage   90.23%   90.22%   -0.02%     
==========================================
  Files         629      629              
  Lines      184955   184867      -88     
  Branches    36215    36217       +2     
==========================================
- Hits       166901   166789     -112     
- Misses      11012    11029      +17     
- Partials     7042     7049       +7     

Files with missing lines	Coverage Δ
lib/internal/debugger/inspect_repl.js	91.76% <100.00%> (+0.05%)	⬆️
lib/internal/repl/utils.js	96.34% <100.00%> (+0.08%)	⬆️
lib/repl.js	94.89% <100.00%> (-0.02%)	⬇️

... and 41 files with indirect coverage changes

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[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/65785/