Fix bundled extensions not being loaded (#7359)

* Fix bundled extensions not being loaded

- Also show that this fixes it by added an example bundled
  extension to 'open-lens'

Signed-off-by: Sebastian Malton <sebastian@malton.name>

* Fix build

Signed-off-by: Sebastian Malton <sebastian@malton.name>

* Add explanatory comment for inline require

Signed-off-by: Sebastian Malton <sebastian@malton.name>

---------

Signed-off-by: Sebastian Malton <sebastian@malton.name>

packages/open-lens/src/common/example-bundled-extension.injectable.ts

@@ -0,0 +1,21 @@
+import { bundledExtensionInjectionToken } from "@k8slens/legacy-extensions";
+import { getInjectable } from "@ogre-tools/injectable";
+import exampleBundledExtensionManifest from "@k8slens/legacy-extension-example/package.json";
+
+const exampleBundledExtensionInjectable = getInjectable({
+  id: "example-bundled-extension",
+  instantiate: (di) => ({
+    manifest: exampleBundledExtensionManifest,
+    /**
+     * Inline `require` is needed as to delay the loading and execution of the JS file until it is needed.
+     *
+     * Futhermore there might be code that runs "during load" and shouldn't be executed until everything is
+     * setup for the extensions (ie globals).
+     */
+    main: () => require("@k8slens/legacy-extension-example/main").default,
+    renderer: () => require("@k8slens/legacy-extension-example/renderer").default,
+  }),
+  injectionToken: bundledExtensionInjectionToken,
+});
+
+export default exampleBundledExtensionInjectable;