Propagate route harvest cancellation

[MrAlias]

Summary

• Thread the route harvest timeout context into Java route extraction.
• Use the context-aware JVM attach path for Java route harvesting.
• Close the route output reader when the harvest context is canceled so blocked reads can unwind.
• Add tests for repeated Java harvest timeouts and canceled blocked route output reads.

Why

This completes the route-harvester integration step for #2034 after the internal JVM attach path gained context support. Previously, the harvester could return on timeout while the Java extraction worker continued blocked in the background. Passing the timeout context through attach and output reading gives the worker a cancellation path instead of accumulating retained workers across repeated timeouts.

Fixes #2034.

Validation

• make generate
• go test ./pkg/internal/transform/route/harvest
• go test ./pkg/internal/jvmtools/...
• GOOS=darwin go test -c -o /tmp/harvest-darwin.test ./pkg/internal/transform/route/harvest
• go test ./pkg/internal/transform/route/...

[codecov]

Codecov Report

❌ Patch coverage is 32.94118% with 57 lines in your changes missing coverage. Please review.
✅ Project coverage is 69.01%. Comparing base (4a7d78e) to head (3354810).

Files with missing lines	Patch %	Lines
...g/internal/transform/route/harvest/java/archive.go	26.98%	35 Missing and 11 partials ⚠️
...internal/transform/route/harvest/java/extractor.go	33.33%	7 Missing and 3 partials ⚠️
pkg/internal/transform/route/harvest/harvester.go	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2423      +/-   ##
==========================================
- Coverage   69.11%   69.01%   -0.10%     
==========================================
  Files         332      332              
  Lines       44197    44252      +55     
==========================================
- Hits        30546    30542       -4     
- Misses      11775    11817      +42     
- Partials     1876     1893      +17     

Flag	Coverage Δ
integration-test	51.14% <18.18%> (-0.22%)	⬇️
integration-test-arm	27.66% <0.00%> (+0.38%)	⬆️
integration-test-vm-5.15-lts	?
integration-test-vm-6.18-lts	?
k8s-integration-test	37.07% <0.00%> (+0.04%)	⬆️
oats-test	36.50% <18.18%> (+0.19%)	⬆️
unittests	62.49% <39.39%> (-0.05%)	⬇️

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[mariomac]

Pretty good!!! I just have few cosmetic suggestions.

[grcevski]

LGTM!