ADD warning for decorators added "mid-kind"

[tmeasday]

Issue: #5781

[vercel]

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[ndelangen]

FAIL  examples/angular-cli/angularshots.test.js
  ● Test suite failed to run

    warn: You have added a decorator to the kind 'Custom|Dependencies' after a story has already been added.
    In Storybook 4 this applied the decorator only to subsequent stories. In Storybook 5+ it applies to all stories.
    This is probably not what you intended. Read more here: https://github.com/storybooks/storybook/blob/master/MIGRATION.md

      45 | global.console.warn = throwWarning;
      46 | 

      at throwMessage (scripts/jest.init.js:47:15)
      at BufferedConsole.throwWarning [as warn] (scripts/jest.init.js:57:10)
      at Object.api.addDecorator (lib/client-api/dist/client_api.js:385:17)
      at Object.<anonymous> (examples/angular-cli/src/stories/component-with-di/di.component.stories.ts:20:4)
      at requireContext (node_modules/babel-plugin-require-context-hook/register.js:34:10)
      at examples/angular-cli/.storybook/config.ts:40:12
          at Array.forEach (<anonymous>)
      at loadStories (examples/angular-cli/.storybook/config.ts:39:14)
      at Object.ConfigApi.configure (lib/client-api/dist/config_api.js:120:9)
      at Object.<anonymous> (examples/angular-cli/.storybook/config.ts:44:11)
      at configure (addons/storyshots/storyshots-core/dist/frameworks/configure.js:42:11)
      at Object.load (addons/storyshots/storyshots-core/dist/frameworks/angular/loader.js:43:26)
      at loadFramework (addons/storyshots/storyshots-core/dist/frameworks/frameworkLoader.js:36:17)
      at testStorySnapshots (addons/storyshots/storyshots-core/dist/api/index.js:76:36)
      at Object.<anonymous> (examples/angular-cli/angularshots.test.js:24:30)