fix: keep proxies opaque in util.inspect when showProxy is false

[azadgupta1]

Currently, util.inspect unwraps proxies even when showProxy is false,
which can trigger traps for nested proxies and lead to unexpected errors.

This change:

• Treats proxies as opaque when showProxy is false.
• Keeps the original target for internal inspection.
• Adds a regression test to ensure that accessing nested proxies does not throw when showProxy is disabled.

Refs: #61061

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.42%. Comparing base (900d329) to head (35e258c).
⚠️ Report is 159 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #61068      +/-   ##
==========================================
- Coverage   88.55%   88.42%   -0.14%     
==========================================
  Files         703      703              
  Lines      208260   208550     +290     
  Branches    40155    40135      -20     
==========================================
- Hits       184430   184410      -20     
- Misses      15837    16148     +311     
+ Partials     7993     7992       -1     

Files with missing lines	Coverage Δ
lib/internal/util/inspect.js	99.67% <100.00%> (+0.03%)	⬆️

... and 93 files with indirect coverage changes

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[benjamingr]

I think this is the opposite of what @jasnell wanted?

[BridgeAR]

This actually does not fix the issue, while it fails many tests

[BridgeAR]

Closing in favor of #61077