fix(storage): close Files.walk stream in deleteRepo to stop leak

[justinsiek]

Closes #5548

Close Files.walk stream so directory handle is released immediately instead of leaking.

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 52.16%. Comparing base (564ccdb) to head (8ac3d5f).
⚠️ Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
...til/dataset/GitVersionControlLocalFileStorage.java	0.00%	5 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #5575      +/-   ##
============================================
- Coverage     52.17%   52.16%   -0.02%     
+ Complexity     2482     2478       -4     
============================================
  Files          1068     1068              
  Lines         41311    41312       +1     
  Branches       4439     4439              
============================================
- Hits          21556    21551       -5     
- Misses        18490    18495       +5     
- Partials       1265     1266       +1     

Flag	Coverage Δ		*Carryforward flag
access-control-service	64.61% <ø> (ø)
agent-service	33.76% <ø> (ø)		Carriedforward from 564ccdb
amber	53.25% <0.00%> (-0.04%)	⬇️
computing-unit-managing-service	1.65% <ø> (ø)
config-service	56.06% <ø> (ø)
file-service	38.32% <ø> (ø)
frontend	46.42% <ø> (ø)		Carriedforward from 564ccdb
pyamber	90.72% <ø> (ø)		Carriedforward from 564ccdb
python	90.75% <ø> (ø)		Carriedforward from 564ccdb
workflow-compiling-service	58.69% <ø> (ø)

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[Yicong-Huang]

Hi @justinsiek please use our PR template. Please feel free to reopen once it is ready. Thanks!