feat(gpu): add validation package

[betterengineering]

Overview

We need to validate a DatadogAgent resource without applying.

Steps

Update pkg/validate/testdata/valid_datadogagent.yaml with your changes and run the go test:

go test ./pkg/validate/ -run TestParseAndValidateFile -v

[datadog-prod-us1-5]

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 46.98% (+0.02%)

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