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add user-specified  ns to --dry-run created obj

Fixes https://github.com/kubernetes/kubernetes/issues/51068

**Release note**:
```release-note
NONE
```

Includes a namespace in a created resource's metadata when `--dry-run` is used if:
- a namespace was explicitly set by the user (via `--namespace`)
- No errors occur accessing the object's metadata

cc @fabianofranz @deads2k