Refine device discovery a bit more. (#24481)
### Description
<!-- Describe your changes. -->
Fix some issues.
Use adapter number instead of bus number. Bus number doesn't work as
expected on VMs.
Disable for XBOX build. Needs different handling for adapter lookup.
Use adapter number as device_id when creating DML OrtEpDevice.
Fix some issues with the metadata.
### Motivation and Context
<!-- - Why is this change required? What problem does it solve?
- If it fixes an open issue, please link to the issue here. -->
