These directories contain the generated project files from the Bazel IntelliJ plugin. See these links for info:

https://github.com/bazelbuild/intellij/blob/8c92239f41b20dcf88a22dcb3f44b5a9bdf46a95/.gitignore
https://github.com/bazelbuild/intellij/blob/8c92239f41b20dcf88a22dcb3f44b5a9bdf46a95/base/src/com/google/idea/blaze/base/sync/data/BlazeDataStorage.java#L36