[lldb/Reproducers] Don't recursively record everything in the CWD

[lldb/Reproducers] Don't recursively record everything in the CWD

RecordInterestingDirectory was added to collect dSYM bundles and their
content. For the current working directory we only want the directory to
be part of the VFS, not necessarily its contents. This patch renames the
current method to RecordInterestingDirectoryRecursively and adds a new
one that's not recursive.