## 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/test/test_property_definition.py
super().setUp()
        EventDefinition.objects.get_or_create(team=self.team, name="$pageview")
        PropertyDefinition.objects.get_or_create(
            team=self.team, name="$current_url", defaults={"query_usage_30_day": 3}
        )
        PropertyDefinition.objects.get_or_create(team=self.team, name="$browser")
        PropertyDefinition.objects.get_or_create(team=self.team, name="first_visit")
        PropertyDefinition.objects.get_or_create(team=self.team, name="is_first_movie")
        PropertyDefinition.objects.get_or_create(
            team=self.team, name="app_rating", defaults={"query_usage_30_day": 1, "is_numerical": True}
        )
        PropertyDefinition.objects.get_or_create(team=self.team, name="plan", defaults={"query_usage_30_day": 1})
        PropertyDefinition.objects.get_or_create(team=self.team, name="purchase_value", defaults={"is_numerical": True})
        PropertyDefinition.objects.get_or_create(team=self.team, name="purchase", defaults={"is_numerical": True})
        PropertyDefinition.objects.create(
            team=self.team, name="$initial_referrer", property_type="String"
        )  
        EventProperty.objects.get_or_create(team=self.team, event="$pageview", property="$browser")
        EventProperty.objects.get_or_create(team=self.team, event="$pageview", property="first_visit")
        EventProperty.objects.create(team=self.team, event="another_event", property="first_visit")
    def test_individual_property_formats(self):