Add rich text editor characterization tests [WPB-22420] - #22252
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Summary
Adds comprehensive characterization tests for the current rich text editor and Markdown behavior.
The purpose of this pull request is to establish a reliable behavioral baseline before updating Lexical in #21682.
It intentionally does not update Lexical or change any production behavior. The tests capture what Wire does today so that behavioral changes introduced by the dependency upgrade become visible and can be reviewed individually.
Important: this also verifies known incorrect behavior
Some of these tests deliberately verify behavior that we already know is wrong.
For example, entering:
14. - 25. septemberis currently interpreted as an ordered list:
This is the current behavior and the corresponding characterization test is expected to pass.
The test is not an assertion that this is the behavior we want. It records the behavior we have today.
This pull request is intentionally focused on tests.