Slowest 20 targets

//src/test/shell/bazel:bazel_bootstrap_distfile_test on macOS (shard 1): PASSED in 1344.0s (log)
//src/test/shell/bazel:bazel_bootstrap_distfile_tar_test on Ubuntu 22.04 LTS: PASSED in 963.1s (log)
//src/test/shell/bazel:bazel_bootstrap_distfile_tar_test on Ubuntu 20.04 LTS: PASSED in 906.6s (log)
//src/test/shell/bazel:bazel_determinism_test on Ubuntu 22.04 LTS: PASSED in 894.2s (log)
//src/test/shell/bazel:bazel_bootstrap_distfile_test on CentOS 7: PASSED in 854.9s (log)
//src/test/shell/bazel:bazel_determinism_test on Ubuntu 20.04 LTS: PASSED in 849.5s (log)
//src/test/shell/bazel:bazel_bootstrap_distfile_tar_test on CentOS 7: PASSED in 844.5s (log)
//src/test/shell/bazel:bazel_bootstrap_distfile_test on Windows: PASSED in 813.2s (log)
//src/test/shell/bazel:bazel_bootstrap_distfile_test on Ubuntu 22.04 LTS: PASSED in 758.8s (log)
//src/test/shell/bazel:bazel_java_test (shard 2/2) on Ubuntu 22.04 LTS: PASSED in 718.3s (log)
//src/test/shell/bazel:bazel_java_test (shard 1/2) on Ubuntu 22.04 LTS: PASSED in 717.8s (log)
//src/test/shell/bazel:bazel_bootstrap_distfile_test on Ubuntu 20.04 LTS: PASSED in 702.9s (log)
//src/test/shell/bazel:bazel_java_test (shard 2/2) on Ubuntu 20.04 LTS: PASSED in 701.8s (log)
//src/test/shell/integration:target_compatible_with_test on Ubuntu 22.04 LTS: PASSED in 699.5s (log)
//src/test/shell/bazel:bazel_java_test (shard 1/2) on Ubuntu 20.04 LTS: PASSED in 699.2s (log)
//src/test/shell/bazel:bazel_determinism_test on CentOS 7: PASSED in 681.0s (log)
//src/test/shell/integration:target_compatible_with_test on CentOS 7: PASSED in 680.2s (log)
//src/test/shell/integration:target_compatible_with_test on Windows: PASSED in 661.4s (log)
//src/test/shell/bazel:bazel_java_test (shard 2/2) on CentOS 7: PASSED in 651.6s (log)
//src/test/shell/bazel:bazel_java_test (shard 1/2) on CentOS 7: PASSED in 613.6s (log)

Bazel

doc: clarify how to run migrate_to_bazel

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