Undo template gen removal during deprecation property removal

[Marklb]

Issue:

PR #19442 removed the deprecated component property from the StoryFn return, but it also removed the template generation of the story component when template isn't provided in the StoryFn return. Unless I am missing something, the template generation is still needed, unless we expect anything using the renderer to pass in the component and manually call computesTemplateFromComponent to generate a template for the story to use.

What I did

Added component template computation back to the renderer.

How to test

• Is this testable with Jest or Chromatic screenshots? This is testable, but the Angular tests aren't working in this branch. I noticed the problem while fixing the tests in PR Build: Upgrade Jest to version 28 #19613
• Does this need a new example in the kitchen sink apps?
• Does this need an update to the documentation?

If your answer is yes to any of these, please make sure to include it in your PR.

[ndelangen]

@Marklb could you update this PR by merging in the next branch?