Update jaas.config for GCP managed Kafka (per Google docs)

[mike-pt]

Per GCP docs this is the correct JaasConfig:

https://cloud.google.com/managed-service-for-apache-kafka/docs/quickstart-java#configure_and_run_the_application

What changes did you make? (Give an overview)
Fixed the JaasConfig for GCP managed Kafka

Is there anything you'd like reviewers to focus on?
Yes Google doc states this:

bootstrap.servers=bootstrap.CLUSTER_ID.us-central1.managedkafka.PROJECT_ID.cloud.goog:9092
value.serializer=org.apache.kafka.common.serialization.StringSerializer
key.serializer=org.apache.kafka.common.serialization.StringSerializer
security.protocol=SASL_SSL
sasl.mechanism=OAUTHBEARER
sasl.login.callback.handler.class=com.google.cloud.hosted.kafka.auth.GcpLoginCallbackHandler
sasl.jaas.config=org.apache.kafka.common.security.oauthbearer.OAuthBearerLoginModule required;

If I got it correct "required" is already appended so I don't need to add it in this line, please confirm as I'm not to familiar with the code.

How Has This Been Tested? (put an "x" (case-sensitive!) next to an item)

• No need to
• Manually (please, describe, if necessary)

The generated config was failing and changing this line fixed it.

NOT WORKING:

    producerProperties: {}
    properties:
      security.protocol: SASL_SSL
      sasl.mechanism: OAUTHBEARER
      sasl.jaas.config: org.apache.kafka.common.security.oauthbearer.OAuthBearerLoginModule
        required;
      sasl.client.callback.handler.class: com.google.cloud.hosted.kafka.auth.GcpLoginCallbackHandler

WORKING:

    producerProperties: {}
    properties:
      security.protocol: SASL_SSL
      sasl.mechanism: OAUTHBEARER
      sasl.jaas.config: org.apache.kafka.common.security.oauthbearer.OAuthBearerLoginModule
        required;
      sasl.client.callback.handler.class: com.google.cloud.hosted.kafka.auth.GcpLoginCallbackHandler

• Unit checks
• Integration checks
• Covered by existing automation

Checklist (put an "x" (case-sensitive!) next to all the items, otherwise the build will fail)

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (e.g. ENVIRONMENT VARIABLES)
• My changes generate no new warnings (e.g. Sonar is happy)
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged

Check out Contributing and Code of Conduct

[github-actions]

Hi mike-pt! 👋

Welcome, and thank you for opening your first PR in the repo!

Please wait for triaging by our maintainers.

Please take a look at our contributing guide.

[Haarolean]

@Muchembi hi, could you take a look please?