Fix openAPI warning in CRD definition

[clamoriniere]

What does this PR do?

Update CRD struct definition

the 2 OpenAPI warning was:

API rule violation: list_type_missing,./api/v1alpha1,ConfigDirSpec,Items
API rule violation: names_match,./api/v1alpha1,LogCollectionConfig,ContainerSymlinksPath

Motivation

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[codecov-commenter]

Codecov Report

Merging #367 (f409449) into v0.7 (aa76649) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             v0.7     #367   +/-   ##
=======================================
  Coverage   65.02%   65.02%           
=======================================
  Files          63       63           
  Lines        6911     6911           
=======================================
  Hits         4494     4494           
  Misses       2098     2098           
  Partials      319      319           

Flag	Coverage Δ
unittests	65.02% <ø> (ø)

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

Impacted Files	Coverage Δ
api/v1alpha1/datadogagent_types.go	100.00% <ø> (ø)

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[jtappa]

👍🏻 from docs team