[LabKey CI] Replace GraalJS-based Markdown implementation with commonmark-java

[labkey-adam]

Using GraalJS to execute a JavaScript implementation of Markdown is an unnecessarily unwieldy rendering approach. GraalJS adds 60MB of code to our distributions and presents deployment problems since it includes some native code. commonmark-java provides a native Java implementation of the Commonmark standard Markdown specification) that is highly compatible with our GraalJS implementation, much simpler to integrate (no pooling and no exceptions at webapp reload), and 1/300 the size. It also includes an extension mechanism allowing us to extend and customize the implementation.

• Add and integrate commonmark-java library
• Add extensions to get us close to parity with previous impl (Autolink, Strikethrough, Tables)
• Add extensions requested by docs team (Header Anchor and Image Attributes)
• Fix line break compatibility issue
• Remove GraalJS
• Code review @labkey-jeckels
• TC & merge
• Docs handoff
• Schedule future cleanup of XDG_CACHE_HOME and -Dpolyglot.engine.resourcePath @labkey-willm
• Manual testing @labkey-mohara
• Sanitize: escape script/html tags on render
• Fix ModeratorReviewTest
• Update MarkdownTestCase
• Review & approve PRs @labkey-tchad @labkey-klum --> merge
• Manual test script/html escaping @labkey-tchad
• Add test(s) for Markdown-based injection @labkey-tchad
  • Add tests for escaped characters in markdown testAutomation#2256

[labkey-jeckels]

@labkey-mohara the Graal guidance at https://www.labkey.org/Documentation/wiki-page.view?name=trouble#graal can disappear as of this change

[labkey-mohara]

I've run through the markdown formatting we document, and tried a variety of messages to confirm the new implementation is consistent with the previous, plus the nifty new heading anchors make it much more likely we'll start using it for more docs.

If there's a test list to run through that I didn't find, let me know - otherwise I'm calling it manual tested and it's on the backlog for updating docs.