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Add a container type to the runtime manager's container status
**What this PR does / why we need it**:
This is Step 1 of the "Debug Containers" feature proposed in #35584 and is hidden behind a feature gate. Debug containers exist as container status with no associated spec, so this new runtime label allows the kubelet to treat containers differently without relying on spec.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: cc #27140
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
**Integrating feedback**:
- [x] Remove Type field in favor of a help method
**Dependencies:**
- [x] #46261 Feature gate for Debug Containers
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