Fixes an issue where attaching by program would fail if the program name
was a partial name (e.g. "foobar" instead of "/path/to/foobar").
We failed to create the target which caused the attach to fail. Now we
fallback to the dummy target and update to the real target after the
attach completes.
Here is an example launch configuration that fail:
```
{
"type": "lldb-dap",
"name": "Attach (wait)",
"request": "attach",
"program": "foobar",
"waitFor": true
},
```
e7483770c7