Build/Test Tools: migrate to Docker Compose v2

[swissspidy]

Trac ticket: https://core.trac.wordpress.org/ticket/60901

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[swissspidy]

The current test failures all seem to be related to 502 Bad Gateway errors on WordPress.org.

[swissspidy]

Some of the PHPUnit test failures are because the workflow uses the phpunit-tests-run.yml file from trunk, which doesn't yet have this fix.

This will be resolved when committing this change to trunk.

Same with the performance tests failures, which check out the previous commit which of course still uses docker-compose.

[swissspidy]

Committed in https://core.trac.wordpress.org/changeset/57918

There will likely be some follow-up commits though.