vfs: support renaming implicit ZIP directories

[trivikr]

Fixes: #65751

Treat archive entry prefixes as directories when renaming with ZipProvider. Move all descendant entries to the new prefix for both asynchronous and synchronous operations.

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Assisted-by: codex:gpt-5.6-sol

[codecov]

Codecov Report

❌ Patch coverage is 89.61039% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.96%. Comparing base (6e7818e) to head (1bb560a).

Files with missing lines	Patch %	Lines
lib/internal/vfs/providers/ziparchive.js	89.61%	6 Missing and 2 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #65752   +/-   ##
=======================================
  Coverage   89.95%   89.96%           
=======================================
  Files         757      757           
  Lines      258053   258104   +51     
  Branches    48934    48936    +2     
=======================================
+ Hits       232144   232203   +59     
- Misses      16962    16970    +8     
+ Partials     8947     8931   -16     

Files with missing lines	Coverage Δ
lib/internal/vfs/providers/ziparchive.js	96.83% <89.61%> (-1.11%)	⬇️

... and 26 files with indirect coverage changes

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