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Fix device unmap for non-attachable plugin case

**What this PR does / why we need it**:

This PR fixes following problem.

- If plugin is non-attachable, global unmap path isn't stored in asw,
  then plugin fails to unmap volume. To store the path, this PR moves
  MarkDeviceAsMounted operation from the `if volumeAttacher != nil` block.

**Which issue(s) this PR fixes**: Fixes #60025

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

/sig storage
/cc @msau42 @jingxu97 
@dhirajh @ianchakeres @mlmhl