fix clusterrole for kustomize

[celenechang]

What does this PR do?

Fix one more RBAC issue for kustomize deploys

Motivation

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Additional Notes

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[codecov-commenter]

Codecov Report

Merging #295 (75c57f0) into main (e026d84) will increase coverage by 21.66%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             main     #295       +/-   ##
===========================================
+ Coverage   36.59%   58.25%   +21.66%     
===========================================
  Files          61       59        -2     
  Lines       10233     6296     -3937     
===========================================
- Hits         3745     3668       -77     
+ Misses       6211     2358     -3853     
+ Partials      277      270        -7     

Flag	Coverage Δ
unittests	58.25% <ø> (+21.66%)	⬆️

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Impacted Files	Coverage Δ
controllers/datadogagent_controller.go	60.60% <ø> (ø)
api/v1alpha1/zz_generated.openapi.go
api/v1alpha1/zz_generated.deepcopy.go

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