Document and test schema-based multitenancy on MariaDB and MySQL

[yrodiere]

Following the discussion at https://quarkusio.zulipchat.com/#narrow/channel/187038-dev/topic/Rest.20Data.20Panache.20multi.20tenancy/with/523999553 and https://hibernate.atlassian.net/browse/HHH-19557

[quarkus-bot]

/cc @gsmet (hibernate-orm)

[github-actions]

🙈 The PR is closed and the preview is expired.

[quarkus-bot]

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[quarkus-bot]

Status for workflow Quarkus CI

This is the status report for running Quarkus CI on commit 53f58c0.

✅ The latest workflow run for the pull request has completed successfully.

It should be safe to merge provided you have a look at the other checks in the summary.

You can consult the Develocity build scans.