[MM-37664] Remove deprecated Backend field from plugin manifest (#18064)

app/plugin_hooks_test.go

@@ -45,7 +45,7 @@ func SetAppEnvironmentWithPlugins(t *testing.T, pluginCode []string, app *App, a
 		backend := filepath.Join(pluginDir, pluginID, "backend.exe")
 		utils.CompileGo(t, code, backend)
 
-		ioutil.WriteFile(filepath.Join(pluginDir, pluginID, "plugin.json"), []byte(`{"id": "`+pluginID+`", "backend": {"executable": "backend.exe"}}`), 0600)
+		ioutil.WriteFile(filepath.Join(pluginDir, pluginID, "plugin.json"), []byte(`{"id": "`+pluginID+`", "server": {"executable": "backend.exe"}}`), 0600)
 		_, _, activationErr := env.Activate(pluginID)
 		pluginIDs = append(pluginIDs, pluginID)
 		activationErrors = append(activationErrors, activationErr)
@@ -1083,7 +1083,7 @@ func TestHookMetrics(t *testing.T) {
 	}
 `
 		utils.CompileGo(t, code, backend)
-		ioutil.WriteFile(filepath.Join(pluginDir, pluginID, "plugin.json"), []byte(`{"id": "`+pluginID+`", "backend": {"executable": "backend.exe"}}`), 0600)
+		ioutil.WriteFile(filepath.Join(pluginDir, pluginID, "plugin.json"), []byte(`{"id": "`+pluginID+`", "server": {"executable": "backend.exe"}}`), 0600)
 
 		// Setup mocks before activating
 		metricsMock.On("ObservePluginHookDuration", pluginID, "Implemented", true, mock.Anything).Return()