core-plugin-api: remove exprerimental plugin options

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

packages/test-utils/alpha-api-report.md

@@ -4,17 +4,10 @@
 
 ```ts
 import { Observable } from '@backstage/types';
-import { PropsWithChildren } from 'react';
-import { default as React_2 } from 'react';
 import { TranslationApi } from '@backstage/core-plugin-api/alpha';
 import { TranslationRef } from '@backstage/core-plugin-api/alpha';
 import { TranslationSnapshot } from '@backstage/core-plugin-api/alpha';
 
-// @alpha
-export const MockPluginProvider: ({
-  children,
-}: PropsWithChildren<{}>) => React_2.JSX.Element;
-
 // @alpha (undocumented)
 export class MockTranslationApi implements TranslationApi {
   // (undocumented)

packages/test-utils/src/alpha.ts

@@ -14,5 +14,4 @@
  * limitations under the License.
  */
 
-export * from './testUtils/MockPluginProvider';
 export * from './testUtils/apis/TranslationApi';

packages/test-utils/src/testUtils/MockPluginProvider.tsx

@@ -1,36 +0,0 @@
-/*
- * Copyright 2020 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.
- */
-
-import React, { PropsWithChildren } from 'react';
-import { PluginProvider } from '@backstage/core-plugin-api/alpha';
-import { createPlugin } from '@backstage/core-plugin-api';
-
-/**
- * Mock for PluginProvider to use in unit tests
- * @alpha
- */
-export const MockPluginProvider = ({ children }: PropsWithChildren<{}>) => {
-  type TestInputPluginOptions = {};
-  type TestPluginOptions = {};
-  const plugin = createPlugin({
-    id: 'my-plugin',
-    __experimentalConfigure(_: TestInputPluginOptions): TestPluginOptions {
-      return {};
-    },
-  });
-
-  return <PluginProvider plugin={plugin}>{children}</PluginProvider>;
-};