Add v1beta1 CRD deprection warning

[levan-m]

What does this PR do?

Adds log line about upcoming v1beta1 CRD deprecation and warning in the readme.

Readme warning preview:

[!WARNING] Operator release v0.1.7 removes support for DatadogAgent v1alpha1 reconciliation (v2APIEnabled flag). v0.1.8 will remove conversion webhook as well and users will not be able to apply DadadogAgent v1alpha1 manifest.

Operator release v1.8.0 will deprecate CRDs of apiextensions.k8s.io/v1beta1 version. They will be kept in the repo but will not be updated. They will be removed in release v1.10.0.

Motivation

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Additional Notes

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Minimum Agent Versions

Are there minimum versions of the Datadog Agent and/or Cluster Agent required?

• Agent: vX.Y.Z
• Cluster Agent: vX.Y.Z

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Checklist

• [ ] PR has at least one valid label: bug, enhancement, refactoring, documentation, tooling, and/or dependencies
• [ ] PR has a milestone or the qa/skip-qa label

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 33.33333% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 59.38%. Comparing base (8981855) to head (2f51802). Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1200      +/-   ##
==========================================
+ Coverage   59.16%   59.38%   +0.21%     
==========================================
  Files         175      176       +1     
  Lines       21944    22108     +164     
==========================================
+ Hits        12984    13128     +144     
- Misses       8164     8178      +14     
- Partials      796      802       +6     

Flag	Coverage Δ
unittests	59.38% <33.33%> (+0.21%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
controllers/setup.go	59.66% <33.33%> (-1.40%)	:arrow_down:

... and 4 files with indirect coverage changes

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[hjkatz]

Is this PR's title/changelog entry misleading?

Does the datadog-operator at version 1.8.0 no longer support v1alpha1 or v1beta1?

[levan-m]

Hello, notice is about changes coming in v1.8.0 for two different Kinds:

• DatadogAgent v1alpha1 - Operator will not support v1alpha1 reconciliation which was possible with v2APIEnabled set to false. Conversion webhook will be removed as well, v2alpha1 will be stored, server version by default and users won't be able to apply v1alpha1 version.
• CustomResourceDefinition v1beta1 - we will stop updating v1beta1 CRDs found here and will remove these files eventually.