Plugins: Use handler middleware from the SDK (#93445)

updates sdk to v0.251.0

pkg/plugins/ifaces.go

@@ -88,13 +88,7 @@ type FoundPlugin struct {
 
 // Client is used to communicate with backend plugin implementations.
 type Client interface {
-	backend.QueryDataHandler
-	backend.CheckHealthHandler
-	backend.StreamHandler
-	backend.AdmissionHandler
-	backend.ConversionHandler
-	backend.CallResourceHandler
-	backend.CollectMetricsHandler
+	backend.Handler
 }
 
 // BackendFactoryProvider provides a backend factory for a provided plugin.
@@ -131,23 +125,6 @@ type Licensing interface {
 	AppURL() string
 }
 
-// ClientMiddleware is an interface representing the ability to create a middleware
-// that implements the Client interface.
-type ClientMiddleware interface {
-	// CreateClientMiddleware creates a new client middleware.
-	CreateClientMiddleware(next Client) Client
-}
-
-// The ClientMiddlewareFunc type is an adapter to allow the use of ordinary
-// functions as ClientMiddleware's. If f is a function with the appropriate
-// signature, ClientMiddlewareFunc(f) is a ClientMiddleware that calls f.
-type ClientMiddlewareFunc func(next Client) Client
-
-// CreateClientMiddleware implements the ClientMiddleware interface.
-func (fn ClientMiddlewareFunc) CreateClientMiddleware(next Client) Client {
-	return fn(next)
-}
-
 type SignatureCalculator interface {
 	Calculate(ctx context.Context, src PluginSource, plugin FoundPlugin) (Signature, error)
 }