Bazel 7 "dangling symbolic link" flake

[dbolduc]

• GCB: https://console.cloud.google.com/cloud-build/builds;region=us-east1/e37e1ada-b4f9-4d8a-9c6d-35737bb96bde;tab=detail?project=cloud-cpp-testing-resources
• Raw: https://storage.googleapis.com/cloud-cpp-community-publiclogs/logs/google-cloud-cpp/main/634e84cdb979dc79c22715b8e56be3e97a929b50/fedora-latest-bazel-coverage/log-e37e1ada-b4f9-4d8a-9c6d-35737bb96bde.txt

ERROR: /h/.cache/bazel/_bazel_root/eab0d61a99b6696edb3d2aff87b585e8/external/io_opentelemetry_cpp/sdk/src/common/BUILD:6:11: output 'external/io_opentelemetry_cpp/sdk/src/common/_virtual_includes/random/src/common/random.h' is a dangling symbolic link
ERROR: /h/.cache/bazel/_bazel_root/eab0d61a99b6696edb3d2aff87b585e8/external/io_opentelemetry_cpp/sdk/src/trace/BUILD:6:11: output 'external/io_opentelemetry_cpp/sdk/src/trace/_virtual_includes/trace/src/trace/span.h' is a dangling symbolic link
...etc...
ERROR: /h/.cache/bazel/_bazel_root/eab0d61a99b6696edb3d2aff87b585e8/external/io_opentelemetry_cpp/api/BUILD:13:11: Symlinking virtual headers for api failed: not all outputs were created or valid
ERROR: /h/.cache/bazel/_bazel_root/eab0d61a99b6696edb3d2aff87b585e8/external/io_opentelemetry_cpp/sdk/BUILD:6:11: Symlinking virtual headers for headers failed: not all outputs were created or valid

We only start seeing this flake when we upgrade to Bazel 7, which comes with "Build without bytes" enabled. This other issue seems related: bazelbuild/bazel#19143

In the 4 or 5 times we have seen the flake, the failure has always been with the @io_opentelemetry_cpp repo. I do not know what makes it special. My guess is their use of include_prefix, e.g.:

https://github.com/open-telemetry/opentelemetry-cpp/blob/c4f39f2be8109fd1a3e047677c09cf47954b92db/sdk/src/trace/BUILD#L10

[dbolduc]

There is an upstream bug: bazelbuild/bazel#20886

We reverted our bazel version to avoid this issue. Let's just close this bug.