Add licensed feature for internal/kubernetes/project_info endpoint

What does this MR do and why?

Add licensed feature for internal/kubernetes/project_info endpoint

Although this endpoint previously existed in core, it was only ever used by EE functionality (all Agent features were licensed).

Now that some agent features are being made available in core, we must add license checks to any functionality that will continue to be a paid feature.

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Related to #340359 (closed)