Use docker for CI replica tests, deprecate dbdeployer

[meiji163]

This PR removes the use of dbdeployer for CI tests in favor of docker and upgrades runner images to Ubuntu 22.04.

Ubuntu 20.04 action runners are deprecated, which we use for running CI replica tests. Since dbdeployer isn't working out of the box on Ubuntu 22.04 runners I'm taking the opportunity to move the CI replica tests to use docker compose. This means we can deprecate the use of the unmaintained dbdeployer and gh-ost-ci-env.

We run the localtests on the following docker images

• mysql/mysql-server:5.7.41
• mysql:8.0.41
• mysql:8.4.3
• percona/percona-server:8.0.41-32 (with RocksDB)

[Copilot]

Pull Request Overview

This PR updates the CI replica tests to use Docker Compose instead of dbdeployer and upgrades runner images to Ubuntu 22.04.

• Updated docker-compose configuration to include additional MySQL command options and environment variables for percona-server.
• Revised documentation to reflect new local test usage with Docker Compose.
• Modified GitHub Actions workflow to run tests on Ubuntu 22.04 with an updated matrix of MySQL images.

Reviewed Changes

Copilot reviewed 3 out of 5 changed files in this pull request and generated no comments.

File	Description
localtests/docker-compose.yml	Added "--character-set-server=utf8mb4" to commands and included INIT_ROCKSDB env for Percona.
doc/local-tests.md	Updated test description and added instructions for running tests with Docker Compose.
.github/workflows/replica-tests.yml	Removed old Ubuntu 20.04 build job and modified the matrix to test multiple MySQL images.

Files not reviewed (2)

• script/cibuild-gh-ost-replica-tests: Language not supported
• script/docker-gh-ost-replica-tests: Language not supported