chore: disable controller downscale test step and update docs (#904)

* chore: disable controller downscale test step and update docs

* Update docs/modules/kafka/partials/supported-versions.adoc

Co-authored-by: Malte Sander <contact@maltesander.com>

* clarify kraft problem

---------

Co-authored-by: Malte Sander <contact@maltesander.com>

Author: razvan

docs/modules/kafka/partials/supported-versions.adoc

@@ -5,3 +5,12 @@
 * 4.1.0 (experimental)
 * 3.9.1 (LTS)
 * 3.7.2 (deprecated)
+
+Support for clusters running in Kraft mode (which includes Apache Kafka 4.x.x) is experimental because it has not been thoroughly tested in production environments yet.
+Migrations from older Kafka version which used Apache Zookeeper for cluster coordination to the new KRaft mode are not supported yet.
+
+Also there are some known issues such as:
+
+* Controller scaling is not reliable.
+* Kerberos authentication is not tested yet.
+* Service exposision is not definitive.

tests/templates/kuttl/operations-kraft/70-assert.yaml.j2 renamed to tests/templates/kuttl/operations-kraft/70-assert.yaml.j2.disabled

@@ -1,3 +1,7 @@
+#
+# This test step is disabled becaus Kraft controller do scale down reliably.
+# This leads to flaky tests.
+#
 {% if not test_scenario['values']['kafka-kraft'].startswith("3.7") %}
 ---
 apiVersion: kuttl.dev/v1beta1