fix: close Files.walk stream in GitVersionControlLocalFileStorage.del…

[LakshyaMalik18]

What changes were proposed in this PR?

GitVersionControlLocalFileStorage.deleteRepo called Files.walk(...) without closing the returned stream. Files.walk returns a closeable Stream backed by an open directory handle, so the handle leaked until GC — which can flake temp-dir deletion on Windows and leak file descriptors on long-lived JVMs.

This PR wraps the walk in a try-with-resources block so the stream (and its underlying directory handle) is always closed, even if iteration throws. No behavior change for callers.

Any related issues, documentation, discussions?

Closes #5548

How was this PR tested?

No new tests added. This is a stream-lifecycle fix with no behavior change; existing dataset deletion paths already exercise deleteRepo.

Was this PR authored or co-authored using generative AI tooling?

The code change was taken from the fix described in issue #5548. The PR description was drafted with assistance from Claude (Anthropic).
Generated-by: Claude (Anthropic)

[github-actions]

👋 Thanks for your first contribution to Texera, @LakshyaMalik18!

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 52.19%. Comparing base (564ccdb) to head (cfd4507).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...til/dataset/GitVersionControlLocalFileStorage.java	0.00%	6 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #5582      +/-   ##
============================================
+ Coverage     52.17%   52.19%   +0.01%     
- Complexity     2482     2485       +3     
============================================
  Files          1068     1068              
  Lines         41311    41312       +1     
  Branches       4439     4439              
============================================
+ Hits          21556    21561       +5     
+ Misses        18490    18488       -2     
+ Partials       1265     1263       -2     

Flag	Coverage Δ		*Carryforward flag
access-control-service	64.61% <ø> (ø)
agent-service	33.76% <ø> (ø)		Carriedforward from 564ccdb
amber	53.31% <0.00%> (+0.02%)	⬆️
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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[xuang7]

Closing this as a duplicate of #5575.