feat: Make PodExecTerminal UI OptIn

Signed-off-by: Carlos Esteban Lopez <lcarlosesteb@vmware.com>

plugins/kubernetes-react/config.d.ts

@@ -0,0 +1,31 @@
+import { PodExecTerminal } from './src/components/PodExecTerminal/PodExecTerminal';
+/*
+ * Copyright 2023 The Backstage Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+export interface Config {
+  kubernetes?: {
+    /**
+     * Pod Exec Terminal config
+     */
+    podExecTerminal?: {
+      /**
+       * Enable `PodExecTerminal` UI feature
+       * @visibility frontend
+       */
+      enable?: boolean;
+    };
+  };
+}