Issue #33529406: Add comprehensive unit test coverage for Markdownify services
Issue #33529406: Add comprehensive unit test coverage for Markdownify services:
- Added MarkdownifyEntityConverterTest to verify entity-to-Markdown conversion.
- Added MarkdownifyHtmlConverterTest to validate HTML-to-Markdown conversion using plugin manager and configuration.
- Added MarkdownifyEntityRendererTest to test entity rendering, alter hooks, logging, and exception handling.
- Added MarkdownifySupportedEntityTypesValidatorTest to confirm supported entity types are read from config and validated correctly.
Closes #3529406