Slowest 20 targets

//src/test/shell/bazel:bazel_bootstrap_distfile_test on macOS (shard 1): PASSED in 1264.2s (log)
//src/test/shell/bazel:bazel_bootstrap_distfile_test on Windows: PASSED in 871.6s (log)
//src/test/shell/bazel:bazel_determinism_test on CentOS 7: PASSED in 829.9s (log)
//src/test/shell/bazel:bazel_bootstrap_distfile_tar_test on CentOS 7: PASSED in 766.7s (log)
//src/test/shell/bazel:bazel_bootstrap_distfile_tar_test on Ubuntu 22.04 LTS: PASSED in 753.3s (log)
//src/test/shell/bazel:bazel_bootstrap_distfile_test on Ubuntu 22.04 LTS: PASSED in 730.3s (log)
//src/test/shell/integration:target_compatible_with_test on CentOS 7: PASSED in 713.1s (log)
//src/test/shell/bazel:bazel_determinism_test on Ubuntu 22.04 LTS: PASSED in 713.0s (log)
//src/test/shell/bazel:bazel_java_test (shard 1/2) on Ubuntu 22.04 LTS: PASSED in 706.7s (log)
//src/test/shell/bazel:bazel_java_test (shard 2/2) on Ubuntu 22.04 LTS: PASSED in 704.3s (log)
//src/test/shell/bazel:bazel_bootstrap_distfile_tar_test on Ubuntu 20.04 LTS: PASSED in 693.2s (log)
//src/test/shell/bazel:bazel_bootstrap_distfile_test on CentOS 7: PASSED in 690.8s (log)
//src/test/shell/bazel:bazel_java_test_jdk17_toolchain_head (shard 2/2) on Ubuntu 22.04 LTS: PASSED in 685.1s (log)
//src/test/shell/bazel:bazel_java_test_jdk17_toolchain_head (shard 1/2) on Ubuntu 22.04 LTS: PASSED in 678.5s (log)
//src/test/shell/bazel:bazel_determinism_test on Ubuntu 20.04 LTS: PASSED in 660.1s (log)
//src/test/shell/bazel:bazel_bootstrap_distfile_test on Ubuntu 20.04 LTS: PASSED in 640.0s (log)
//src/test/shell/integration:target_compatible_with_test on Windows: PASSED in 639.9s (log)
//src/test/shell/bazel:bazel_java_test_jdk17_toolchain_head (shard 2/2) on Ubuntu 20.04 LTS: PASSED in 625.9s (log)
//src/test/shell/bazel:bazel_java_test_jdk17_toolchain_head (shard 1/2) on Ubuntu 20.04 LTS: PASSED in 624.6s (log)
//src/test/shell/bazel:bazel_java_test_jdk21_toolchain_head (shard 2/2) on Windows: PASSED in 558.1s (log)

Bazel

Introduce PackagePiece, and refactor Package.Builder to allow building package pieces

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