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

updates sdk to v0.251.0

pkg/services/pluginsintegration/clientmiddleware/testing.go

@@ -1,6 +1,31 @@
 package clientmiddleware
 
-import "github.com/grafana/grafana-plugin-sdk-go/backend"
+import (
+	"net/http"
+	"net/http/httptest"
+
+	"github.com/grafana/grafana-plugin-sdk-go/backend"
+	"github.com/grafana/grafana-plugin-sdk-go/backend/handlertest"
+	"github.com/grafana/grafana/pkg/services/contexthandler/ctxkey"
+	contextmodel "github.com/grafana/grafana/pkg/services/contexthandler/model"
+	"github.com/grafana/grafana/pkg/services/user"
+	"github.com/grafana/grafana/pkg/web"
+)
+
+func WithReqContext(req *http.Request, user *user.SignedInUser) handlertest.HandlerMiddlewareTestOption {
+	return handlertest.HandlerMiddlewareTestOption(func(cdt *handlertest.HandlerMiddlewareTest) {
+		reqContext := &contextmodel.ReqContext{
+			Context: &web.Context{
+				Req:  req,
+				Resp: web.NewResponseWriter(req.Method, httptest.NewRecorder()),
+			},
+			SignedInUser: user,
+		}
+
+		ctx := ctxkey.Set(req.Context(), reqContext)
+		*req = *req.WithContext(ctx)
+	})
+}
 
 var nopCallResourceSender = backend.CallResourceResponseSenderFunc(func(res *backend.CallResourceResponse) error {
 	return nil