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Conversion from typed to unstructured should set GVK

**What this PR does / why we need it**:
By convention typed objects do not have `TypeMeta` information filled. When the scheme converts a typed object into Unstructured it should set type meta information explicitly otherwise Unstructured object is not recognizable.

**Special notes for your reviewer**:
Bug was not visible to tests because tests were working with a typed object with `TypeMeta` information filled. It was filled by previous tests. I have refactored tests for better isolation. Also fixed some other issues in tests.

Add `?w=1` to the PR's URL to see the diff with whitespace changes ignored.

**Release note**:
```release-note
NONE
```
/kind bug
/sig api-machinery
/cc @smarterclayton @deads2k