Deprecate resources configuration in .spec.kafka in Kafka CR

[scholzj]

Type of change

• Task

Description

This PR deprecates the .spec.kafka.resources field in Kafka CR as approved in the Strimzi Proposal 121. The logic is kept intact and it still can be used. But it is removed in the v1 API.

I also went through the docs, but there were not many references to it, so there are not many changes.

This should resolve #11881.

Checklist

• Update documentation
• Try your changes from Pod inside your Kubernetes and OpenShift cluster, not just locally
• Reference relevant issue(s) and close them after merging
• Update CHANGELOG.md

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.91%. Comparing base (cc1906d) to head (341128a).
⚠️ Report is 7 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #12017      +/-   ##
============================================
- Coverage     74.92%   74.91%   -0.01%     
+ Complexity     6443     6442       -1     
============================================
  Files           343      343              
  Lines         24324    24324              
  Branches       3196     3196              
============================================
- Hits          18224    18223       -1     
  Misses         4828     4828              
- Partials       1272     1273       +1     

Files with missing lines	Coverage Δ
...o/strimzi/operator/cluster/model/KafkaCluster.java	92.59% <ø> (ø)
...a/io/strimzi/operator/cluster/model/KafkaPool.java	100.00% <ø> (ø)

... and 1 file with indirect coverage changes

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[scholzj]

/azp run regression

[azure-pipelines]

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