## Changes
Copying a local file in windows to remote directory in DBFS would fail
if the path was specified as a windows style path (compared to a UNIX
style path). This PR fixes that.
Note, UNIX style paths will continue to work because `filepath.Base`
respects both `/` and `\` as file separators. See: `IsPathSeparator` in
https://go.dev/src/os/path_windows.go.
Fixes issue: https://github.com/databricks/cli/issues/1109.
## Tests
Integration test and manually
```
C:\Users\shreyas.goenka>Desktop\cli.exe fs cp .\Desktop\foo.txt dbfs:/Users/shreyas.goenka@databricks.com
.\Desktop\foo.txt -> dbfs:/Users/shreyas.goenka@databricks.com/foo.txt
C:\Users\shreyas.goenka>Desktop\cli.exe fs cat dbfs:/Users/shreyas.goenka@databricks.com/foo.txt
hello, world
````
2c0d06715c