Fix devcontainer build-all dependency handling

[bdice]

Summary

• Add the missing Boost iostreams development package required while building Presto's Facebook dependency stack (mvfst).
• Make -j0 in the Velox and Presto wrappers resolve to CPU count instead of ulimit -Hn; the previous behavior expanded to 500000 jobs and filled the filesystem during CMake/build.
• Force bundled s2geometry in the Presto wrapper so VELOX_DEPENDENCY_SOURCE=SYSTEM does not make the embedded Velox configure fail looking for a system s2geometry package.

Debugging Notes

• ucxx-cu13 being installed is not necessarily wrong for CUDA 13 binary packages, but the source build path should be used for this devcontainer flow.
• The branch already had ucxx_ROOT wiring from b7f1d00, and the live wrapper was synced so downstream CMake receives -Ducxx_ROOT=/home/coder/ucxx/cpp/build/pip/cuda-13.1/release.
• A stale/broken installed UCXX binary wheel caused librmm editable build failures through scikit-build's cmake.prefix entry point loading (No module named 'ucxx._lib.libucxx'). Removing stale UCXX binary wheels let source UCXX rebuild normally.
• After that, Presto exposed the missing boost_iostreams dependency, then the missing s2geometry bundled override, then the -j0 job explosion / disk pressure issue.

Validation

• build-all -j0 completed RAPIDS, Velox, and Presto after applying these changes and cleaning/rebuilding.
• Verified build artifacts exist:
  • /opt/velox-build/release/velox/experimental/cudf/tests/velox_cudf_config_test
  • /opt/presto-build/presto_cpp/main/presto_server
  • /opt/presto-build/presto_cpp/main/tests/presto_server_test
• Verified source-built Python imports:
  • ucxx 0.50.00
  • rmm 26.06.00
  • cudf 26.06.00
  • kvikio 26.06.00

Known Follow-up

• python -m pip check still reports libucxx 0.50.0 requires libucx, while this CUDA 13 environment has libucx-cu13. Runtime imports work, but editable source package metadata is not fully aligned with the suffixed UCX runtime package.

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