Upgrade Liquibase to latest version; remove final Java source file and need for `clojure -X:deps prep` (#20611)

* Upgrade Liquibase to latest version

* Try adjusting log

* Fix checksums for the TWO migrations with ID = 32

* FINALLY get Liquibase to use Log4j2

* Set Liquibase ConsoleUIService OutputStream to null OutputStream

* Manually define a package for our H2 proxy class so Java 8 works

* Fix package-name determination code

* Update migrations file spec

* `databasechangelog` shouldn't be upper-case

* Lower-case quartz table names

* More MySQL fixes 

* Properties for all the Quartz tables 

* Formatting tweaks [ci skip]

* Revert a few more busted changes

* Fix more busted changes

* Bump Liquibase version to 4.8.0 to fix MySQL defaultValueBoolean bug

* OMG I think I finally fixed MySQL

* Remove Java source file and prep-deps code

* Remove two more references to bin/prep.sh

* Minor cleanup

* Revert unneeded changes

* Fix busted indentation

* Don't search inside java/ anymore since it's G-O-N-E

* Appease the namespace linter

* Update src/metabase/db/liquibase/h2.clj

* Bump backend dependencies (Jan 2022)

* Revert java-time version upgrade for now until https://github.com/dm3/clojure.java-time/issues/77 is fixed

* Add license overrides

* Bump a few more deps (again). Revert Google/BigQuery and Vertica version bumps

* Revert MariaDB and Redshift version changes

* add step to validate Liquibase migrations to CI

* addColumn should only allow one column.

* Only allow one column added per addColumn change

* Add strict-mode for change sets

* Check that migrations are in order/IDs are unique

* Fix CI

* Tests for the linter!!

* Require remarks when adding new Tables

* Fix CI