Plugins: Tidy up CLI code (#67813)

* more tidying

* move some things around

* more tidying

* fix linter

pkg/plugins/storage/models.go

@@ -21,28 +21,3 @@ type Dependency struct {
 	ID      string
 	Version string
 }
-
-type installedPlugin struct {
-	ID           string       `json:"id"`
-	Name         string       `json:"name"`
-	Type         string       `json:"type"`
-	Info         pluginInfo   `json:"info"`
-	Dependencies dependencies `json:"dependencies"`
-}
-
-type dependencies struct {
-	GrafanaVersion string             `json:"grafanaVersion"`
-	Plugins        []pluginDependency `json:"plugins"`
-}
-
-type pluginDependency struct {
-	ID      string `json:"id"`
-	Type    string `json:"type"`
-	Name    string `json:"name"`
-	Version string `json:"version"`
-}
-
-type pluginInfo struct {
-	Version string `json:"version"`
-	Updated string `json:"updated"`
-}