Database Squash

New process around handling database squashes since https://github.com/azerothcore/azerothcore-wotlk/pull/18197

[!CAUTION] These steps are only for project maintainers who intend to update base files.

Requirements

1. MySQL
2. mysqldump

Usage

[!IMPORTANT] A squash needs to be done on a clean database. Drop all tables in Auth, Characters and World.

1. Run DatabaseSquash.sh (Located in ..\apps\DatabaseSquash)
2. Make a PR

[!IMPORTANT] No DB PRs should be merged during this process!

[!NOTE] During the DB squash procedure, we do NOT move files. The archive dir is NO longer used as part of the DB squash procedure, but simply as a place where to move update files when they get too many as the updates table in base files always will contain the entries from the updates dir they will never be run again on a clean setup.