chore: remove control plane from mayastor

Remove the new control plane from the mayastor repo.
The mbus-api is left with slight modifications so we don't pull in a
 bunch of crates which are not required. In the future we'll probably
 pull it from the control plane repo with feature gates for example.

Add a nix mayastor-unit derivation to allow the control plane to get
 access to specific parts of mayastor only.

.pre-commit-config.yaml

@@ -37,11 +37,3 @@ repos:
         entry: bash -c "npm install @commitlint/config-conventional @commitlint/cli; cat $1 | npx commitlint"
         args: [$1]
         stages: [commit-msg]
-    -   id: openapi-check
-        name: OpenApi Generator
-        description: Ensures OpenApi spec is up to date
-        entry: ./scripts/openapi-check.sh
-        args: ["--changes"]
-        pass_filenames: false
-        language: system
-