## Bug description

The grouped-by-month view in charts is hella confusing. The x-axis shows a date that does not reflect the value on the y-axis.

1. the y-axis shows the number for the END of the month
2. the x-axis reads as "beginning of the month"

![CleanShot 2024-02-05 at 10 23 30@2x](https://github.com/PostHog/posthog/assets/35429197/d78df745-8319-4b78-95fa-d96f18aee357)

### Comparison with daily grouping

Compare the "group by month" view with "group by day". The x-axis labeling aligns with the y-axis values. 

![CleanShot 2024-02-05 at 10 29 20@2x](https://github.com/PostHog/posthog/assets/35429197/998825fa-7406-4214-8310-8f173980f80c)


## How to reproduce

1. Group a chart by month 
2. select "unique events"

## Proposal 

### 1. easy fix - remove the "1." from the labelling

- will still confuse readers with "is this the beginning or end of the month"

![CleanShot 2024-02-05 at 10 23 30@2x](https://github.com/PostHog/posthog/assets/35429197/1a0ae6d4-0e02-4b32-86ab-7b0e069655ed)

### 2. correct fix - show end of month

- removes ambiguity from "is that the beginning or end of month"
- harder to implement because months have different end days

![CleanShot 2024-02-05 at 10 23 30@2x](https://github.com/PostHog/posthog/assets/35429197/61226346-7f97-4bcd-87bf-53fc83c75245)


cc @jannesblobel
posthog/hogql_queries/insights/lifecycle_query_runner.py
from datetime import timedelta
from math import ceil
from typing import Optional, List
from django.utils.timezone import datetime
from posthog.caching.insights_api import (
    BASE_MINIMUM_INSIGHT_REFRESH_INTERVAL,
    REDUCED_MINIMUM_INSIGHT_REFRESH_INTERVAL,
)
from posthog.caching.utils import is_stale
from posthog.hogql import ast
from posthog.hogql.parser import parse_expr, parse_select
from posthog.hogql.printer import to_printed_hogql
from posthog.hogql.property import property_to_expr, action_to_expr
from posthog.hogql.query import execute_hogql_query
from posthog.hogql_queries.query_runner import QueryRunner
from posthog.models import Action
from posthog.hogql_queries.utils.query_date_range import QueryDateRange
from posthog.models.filters.mixins.utils import cached_property
from posthog.schema import (
    LifecycleQuery,
    ActionsNode,
    EventsNode,
    LifecycleQueryResponse,
    InsightActorsQueryOptionsResponse,
)
class LifecycleQueryRunner(QueryRunner):
    query: LifecycleQuery
    query_type = LifecycleQuery
    def to_query(self) -> ast.SelectQuery | ast.SelectUnionQuery: