Prefer directory-capable adapters when selecting a launch adapter for a
resolved directory program. This keeps Go package directories on dlv in
mixed projects that also expose native-debugger root markers such as a
Makefile, instead of selecting gdb/lldb-dap first and rejecting the
directory during validation.
Added a regression test covering a Go module with both go.mod and
Makefile plus local dlv/gdb adapter shims.
Fixes#2020
roboomp
8c25f7d4aa