[KOGITO-9857] Fix podTemplate struct to json inline

[ricardozanini]

Description of the change:
In this PR, we fix the podTemplate struct to include json inline serializable annotations.

Motivation for the change:
See https://issues.redhat.com/browse/KOGITO-9857

Checklist

• Add or Modify a unit test for your change
• Have you verified that tall the tests are passing?

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