Bare minimum self-checks

What do you think of a person who only does the bare minimum?

• I've updated this PR with the latest code from main
• I've done a cursory QA pass of my code locally
• I've ensured all automated status check and tests pass
• I've connected this PR to an issue

Pieces of flare

• I've written a unit or functional test for my code
• I've updated relevant documentation it my code changes it
• I've updated this repo's README if my code changes it
• I've updated this repo's CHANGELOG with my change unless its a trivial change (like updating a typo in the docs)

Finally

• I've requested a review with relevant people

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This PR addresses two bugs:

1. MariaDB wrapper script generates wrong command names: The mariadb-compat-install.sh script was incorrectly generating command names like mariadbdump instead of mariadb-dump, preventing compatibility wrappers for tools like mysqldump from being created. The fix adds a hyphen to correctly form the MariaDB command names.
2. Auto-detection returns wrong client in multi-database test: In the db-client test example, the php-mysql84 service with db_client: auto was incorrectly detecting a mariadb service in the same Landofile due to global auto-detection logic. The fix explicitly sets db_client: mysql:8.4 for the php-mysql84 service in the test to ensure it uses the intended client.