debugger: add --help to node inspect and improve docs

[joyeecheung]

• Add --help / -h to node inspect covering both interactive and non-interactive probe modes. The help text is printed when --help/-h appears before any positional argument to avoid hijacking --help passed to a child script.
• Improve the documentation of probe mode and add examples, explain same-location probe coalescing, TDZ caveat for let/const bindings, basename matching and exit code behavior. Also move it to a section parallel to interactive mode. Remove recommendation of evaluating structured expressions as that is prone to missing info in JSON mode.

Drive-by: when probe mode exits due to invalid arguments, exit with kInvalidCommandLineArgument (9) instead of kGenericUserError (1).

[joyeecheung]

This looks a bit weird in the diff, apparently if you move a block and then add one more level of # to the headings, git would recognize it as a new block. The content below are copied verbatim from the original block below probe mode docs (which was misplaced, this should've followed interactive mode docs, hence this PR moved it back).

[codecov]

Codecov Report

❌ Patch coverage is 99.25373% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 90.03%. Comparing base (1fd4949) to head (b62ed5a).
⚠️ Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/internal/debugger/inspect_helpers.js	98.33%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##             main   #63201    +/-   ##
========================================
  Coverage   90.03%   90.03%            
========================================
  Files         713      713            
  Lines      224699   224995   +296     
  Branches    42473    42533    +60     
========================================
+ Hits       202310   202580   +270     
- Misses      14179    14186     +7     
- Partials     8210     8229    +19     

Files with missing lines	Coverage Δ
lib/internal/debugger/inspect.js	93.97% <100.00%> (+1.30%)	⬆️
lib/internal/debugger/inspect_probe.js	76.34% <100.00%> (-1.50%)	⬇️
lib/internal/debugger/inspect_helpers.js	97.19% <98.33%> (+0.22%)	⬆️

... and 49 files with indirect coverage changes

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