## Is your feature request related to a problem?

As a team accumulates data, they will have events/properties that are no longer in use that clutter their app.

Example from our team:
![image](https://user-images.githubusercontent.com/148820/143202334-42d73ab6-13be-4661-ba7a-83c86788b9e8.png)


## Describe the solution you'd like

Under event/properties stats allow 'hiding' events/properties from view.

## Describe alternatives you've considered

Alternatively, go the route of "verified" events/properties (as He@p) does - show those first. See also https://help.heap.io/category/heap-administration/data-governance/

## Additional context

Note: Existing reports, etc should still work well even with 'removed' events/properties.

Related: https://github.com/PostHog/posthog/issues/7126

#### *Thank you* for your feature request – we love each and every one!

posthog/api/property_definition.py
queryset = PropertyDefinition.objects
        property_definition_fields = ", ".join(
            [f'posthog_propertydefinition."{f.column}"' for f in PropertyDefinition._meta.get_fields() if hasattr(f, "column")]  
        )
        use_enterprise_taxonomy = self.request.user.organization.is_feature_available(AvailableFeature.INGESTION_TAXONOMY)  
        if use_enterprise_taxonomy:
            try:
                from ee.models.property_definition import EnterprisePropertyDefinition
                
                property_definition_fields = ", ".join(
                    [
                        f'{f.cached_col.alias}."{f.column}"'  
                        for f in EnterprisePropertyDefinition._meta.get_fields()
                        if hasattr(f, "column") and f.column not in ["deprecated_tags", "tags"]  
                    ]
                )
                queryset = EnterprisePropertyDefinition.objects.prefetch_related(
                    Prefetch(
                        "tagged_items", queryset=TaggedItem.objects.select_related("tag"), to_attr="prefetched_tags"
                    )
                )
            except ImportError:
                use_enterprise_taxonomy = False
        limit = self.paginator.get_limit(self.request)  
        offset = self.paginator.get_offset(self.request)  
        query = PropertyDefinitionQuerySerializer(data=self.request.query_params)
        query.is_valid(raise_exception=True)
        search_query, search_kwargs = term_search_filter_sql(self.search_fields, query.validated_data.get("search"))
        query_context = (