fix(docs): filter Optional markers from validation column #723
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The crd-ref-docs tool automatically recognizes the
+optionalmarker comments in Go code and renders them as validation entries. A recent upstream change in github.com/elastic/crd-ref-docs master branch started rendering these asOptional: {}text in the validation column, which looks like an empty JSON object and is redundant since the Required column already shows this information.This PR updates the documentation template to filter out these Optional markers while preserving meaningful validation rules like patterns and enums. Also removes the now-redundant customMarkers configuration, as the current version of crd-ref-docs recognizes the optional marker without explicit configuration.
Closes #722