Fixed issues with migration of HTML content to Content Workflow

[tvatavuk]

More robust migration, Fixes #6429.

Summary

The new stored procedure CreateMissingContentWorkflows will ensure that missing workflows and states are populated before running the migration from the old HTML workflows to the new ContentWorkflow model. Once this step is complete, the MigrateHtmlWorkflows procedure will execute, which includes a more robust migration process for mapping old workflow state IDs to the new system.

[tvatavuk]

No code changes in this commit—just Git maintenance to ensure a clean history after a commit from another PR briefly appeared here.

[tvatavuk]

Last commit focuses on cleaning up deprecated functionality and unused files, including updates to the SQL schema. These elements were no longer in use and have been safely removed to streamline the codebase and improve maintainability.

Key Notes:

• The changes do not impact the functionality of the HTML module.
• The cleanup includes the removal of legacy code and database elements that are no longer relevant.

[bdukes]

One of the sites I was testing the upgrade with had a object qualifier in use, which demonstrated that this script is missing/misplacing a few {objectQualifier} tokens. I've added suggestions for most of them, but there was one place where GitHub wouldn't let me add it. I can push that change up in a different way.

[bdukes]

The table aliases in the SELECT list in this procedure and the next need to include {objectQualifier}

[mitchelsellers]

I have tested the updated scripts and this appears to be working for my sites as well.

[tvatavuk]

Thank you @bdukes for ensuring successful integration!
Huge thanks to @bdukes and @mitchelsellers for your dedication and collaboration!