The MirrorMakerIsolatedST.testKMM2RollAfterSecretsCertsUpdateScramSha seems to have several issues which can be improved:

• It should deploy the Kafka clusters in parallel to make the test faster
• It should no directly modify the user secrets. It should use the external secret to change the password (https://strimzi.io/docs/operators/latest/full/configuring.html#type-KafkaUserScramSha512ClientAuthentication-reference)

CC lkral morsak