[e2e] SASL/TLS with implicit CA Kafka Broker test

[maschmid]

Proposed Changes

• 🎁 e2e test for Kafka Broker connecting to Kafka with SASL/TLS without explicitly setting a CA (using an implicit CA from the system/container)

For the purpose of the test, we simulate a system truststore by mounting the knative-eventing-bundle ConfigMap to the data-plane and the kafka-controller (and setting -Djavax.net.ssl.trustStore / SSL_CERT_DIR accordingly) and generate a Certificate for Kafka signed by the knative-eventing-ca-issuer ClusterIssuer

[knative-prow]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 45.51%. Comparing base (8d5c56b) to head (2fd8cfa).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4165   +/-   ##
=======================================
  Coverage   45.51%   45.51%           
=======================================
  Files         270      270           
  Lines       19925    19925           
=======================================
  Hits         9069     9069           
  Misses      10129    10129           
  Partials      727      727           

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[maschmid]

/test upgrade-tests

[knative-prow]

@maschmid: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
upgrade-tests_eventing-kafka-broker_main	2fd8cfa	link	true	/test upgrade-tests

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