Tidy switch of Oracle tests to dev services

[holly-cummins]

Ah, there's nothing like having a PR merged and moving on the next task to help you spot all the problems with the PR. :)

This is a follow-on to #51059. I realised I needed to update the readmes now that dev services are being used. I also noticed that while the start-containers maven profile has content, the content is only an invocation of .github/docker-prune, which is a no-op everywhere but windows CI. #35458 disabled it because it was causing more problems than it was fixing.

Adding @famod and @geoand for review, since they added the original scripts. I think we don't need to do a docker prune if we're using testcontainers, even on Windows, but they may have scars that say otherwise. :)

[quarkus-bot]

/cc @gsmet (hibernate-orm)

[geoand]

but they may have scars that say otherwise

If I did, my brain has repressed them :)

[gsmet]

Spotted a minor typo.

[holly-cummins]

@yrodiere points out we don't run containers on Windows CI, so the Windows of the prune script also can't ever be doing anything. (It could prune locally, maybe, except we have a guard saying pruning should only happen on CI, because otherwise running a build would be taking a machete to local container setups and cause mayhem.)

[holly-cummins]

Accepted and squashed, thanks @gsmet! But accepted on condition that you laugh at the lame joke I made in the review thread.

[quarkus-bot]

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