Automatic merge from submit-queue

Add GroupVersion tags to OpenAPI spec and remove all specs except main one

Tags are used as a grouping mechanism in OpenAPI. We generated one spec per GroupVersion before for this grouping but by adding those tags in this PR, those files have no use. We can always add them back if there were a use-case for them.

**Release note**:

```release-note
Deprecate OpenAPI spec for GroupVersion endpoints in favor of single spec /swagger.json
```

Reference: #13414