tools: update prototype-pollution rule to accept null proto obj

[jasnell]

Allow for...

const kNullProtoObject = Object.freeze({ __proto__: null });
const obj = { __proto__: kNullProtoObject, ... };

Refs: #66678

[aduh95]

Could we simplify this a LOT by re-using kEmptyObject (and have the lint rule accept either __proto__: null or __proto__: kEmptyObject?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.48%. Comparing base (04bd737) to head (e601d34).
⚠️ Report is 17 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #66680      +/-   ##
==========================================
+ Coverage   90.47%   90.48%   +0.01%     
==========================================
  Files         791      791              
  Lines      277097   277088       -9     
  Branches    53277    53280       +3     
==========================================
+ Hits       250696   250725      +29     
+ Misses      16813    16767      -46     
- Partials     9588     9596       +8     

see 34 files with indirect coverage changes

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