use testcontainers directly instead of docker-testkit #4241
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What does this change?
@Conalb97 raised that docker-testkit has some sort of incompatibility with M1 macs on certain JDKs. docker-testkit isn't receiving maintenance updates, and neither is the underlying docker client, so this is a good opportunity to replace it with a direct usage of testcontainers (mainly taking inspiration from Ophan https://github.com/guardian/ophan/blob/2ecb80da40915ce097e4a1de0e29b352b396323e/shared-lib/src/test/scala/app/BaseElasticTest.scala#L153 though we share the container between the tests, instead of a container per test, for a mild performance boost)