UI Extensions: Rename placement to extensionPointId (#65841)

* UI Extensions: Rename `placement` to `extensionPointId`

* Fix tests.

* Fix conflicts and review notes

* Remove `placement` from some other places

packages/grafana-runtime/src/services/pluginExtensions/getPluginExtensions.test.ts

@@ -9,10 +9,10 @@ describe('Plugin Extensions / Get Plugin Extensions', () => {
     const getter: GetPluginExtensions = jest.fn().mockReturnValue({ extensions: [] });
 
     setPluginExtensionGetter(getter);
-    getPluginExtensions({ placement: 'panel-menu' });
+    getPluginExtensions({ extensionPointId: 'panel-menu' });
 
     expect(getter).toHaveBeenCalledTimes(1);
-    expect(getter).toHaveBeenCalledWith({ placement: 'panel-menu' });
+    expect(getter).toHaveBeenCalledWith({ extensionPointId: 'panel-menu' });
   });
 
   test('should throw an error when trying to redefine the app-wide extension-getter function', () => {
@@ -33,7 +33,7 @@ describe('Plugin Extensions / Get Plugin Extensions', () => {
     setPluginExtensionGetter(undefined);
 
     expect(() => {
-      getPluginExtensions({ placement: 'panel-menu' });
+      getPluginExtensions({ extensionPointId: 'panel-menu' });
     }).toThrowError();
   });
 });

packages/grafana-runtime/src/services/pluginExtensions/getPluginExtensions.ts

@@ -1,10 +1,10 @@
 import { PluginExtension } from '@grafana/data';
 
 export type GetPluginExtensions = ({
-  placement,
+  extensionPointId,
   context,
 }: {
-  placement: string;
+  extensionPointId: string;
   context?: object | Record<string | symbol, unknown>;
 }) => {
   extensions: PluginExtension[];