* Change all active TEXT columns in MySQL app DB to LONGTEXT

Add new text.type Liquibase property to dynamically select the correct text type to use, per DB (which is LONGTEXT for MySQL), very similar to the existing blob.type one

Adding new migrations that update all existing app DB TEXT columns to LONGTEXT columns, only for mariadb/mysql

Update migrations linter to ensure no new text types get added, via a new predicate that searches for text types being added

Do the same logic for "blob" now (should be "${blob.type}"), update rule and test

Add test for migrations, that checks the new types, for all types in scope for this PR, to ensure that they have all been changed to their expected DB-specific type (either LONGTEXT for MySQL or TEXT/CLOB for others)

Updating a couple migrations to remove special casing that was originally done only for MySQL to simply make them universally "${text.type}", in order to unify behavior and reduce surprises going forward

Co-authored-by: Cam Saul <github@camsaul.com>