The generated 'Validation' column end up with duplicated values for fields having multiple "required" markers flavors

A Go type having both `+required` and `+kubebuilder:validation:Required` results with having duplicate value (`Required: \{\}`) in `Validation` column.

Please consider folding duplicate values in Validation column so there are unique values (set).

Start by reproducing the issue with a Go type containing both +required and +kubebuilder:validation:Required, then trace how the generated Validation column collects values. Confirm that the output contains one unique Required: {} entry rather than duplicates; no file or test path is named in the issue.

Written by the indexing model from the issue text.