## 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_event_definition.py
import dataclasses
from datetime import datetime
from typing import Any, Dict, List
from uuid import uuid4
import dateutil.parser
from django.utils import timezone
from freezegun.api import freeze_time
from rest_framework import status
from posthog.api.test.test_organization import create_organization
from posthog.api.test.test_team import create_team
from posthog.api.test.test_user import create_user
from posthog.models import Action, EventDefinition, Organization, Team
from posthog.tasks.calculate_event_property_usage import calculate_event_property_usage_for_team
from posthog.test.base import APIBaseTest
@freeze_time("2020-01-02")
class TestEventDefinitionAPI(APIBaseTest):