Add refaster recipes to simplify expected value

[timo-abele]

What's changed?

3 simple refaster recipes added

What's your motivation?

salvaging the changes in https://github.com/openrewrite/rewrite-testing-frameworks/pull/472 adding missing transformations I noticed.

Anything in particular you'd like reviewers to focus on?

These recipes are simpler that the ones in https://github.com/openrewrite/rewrite-testing-frameworks/pull/472: they don't need generics and should work in Java 8. But each test yields:

Recipe was expected to make a change but made no changes.

Anyone you would like to review specifically?

@timtebeek

Have you considered any alternatives or workarounds?

SimplifyChainedAssertJAssertion could probably be extended to cover these cases, but I think refaster is the appropriate level of complexity

Any additional context

Checklist

• [ ] I've added unit tests to cover both positive and negative cases
• [ ] I've read and applied the recipe conventions and best practices
• [ ] I've used the IntelliJ IDEA auto-formatter on affected files