## Bug description

Creating a selector with an attribute isn't working at all.

`[data-attr="bla"]`

## Expected behavior

It should work

## How to reproduce

1. Create action
2. Add an attribute in the selector
3. 


## Additional context

The reason for this is that we store the attributes as `attr__data-attr` but we do not add `attr__` in the filtering. I am working on a solution.


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posthog/test/test_event_model.py
from unittest.mock import call, patch
from posthog.api.test.base import BaseTest
from posthog.models import Action, ActionStep, Element, ElementGroup, Event, Person, Team
from posthog.models.event import Selector, SelectorPart
class TestFilterByActions(BaseTest):
    def test_filter_with_selectors(self):
        Person.objects.create(distinct_ids=["whatever"], team=self.team)
        event1 = Event.objects.create(
            event="$autocapture",
            team=self.team,
            distinct_id="whatever",
            elements=[
                Element(tag_name="a", href="/a-url", nth_child=1, nth_of_type=0, order=1),
                Element(tag_name="button", nth_child=0, nth_of_type=0, order=2),
                Element(tag_name="div", nth_child=0, nth_of_type=0, order=3),
                Element(tag_name="div", nth_child=0, nth_of_type=0, order=4, attr_id="nested",),
            ],