## 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 (
                            SELECT
                                periods.start_of_period as start_of_period,
                                0 AS counts,
                                status
                            FROM {periods_query} as periods
                            CROSS JOIN (
                                SELECT status
                                FROM (SELECT 1)
                                ARRAY JOIN ['new', 'returning', 'resurrecting', 'dormant'] as status
                            ) as sec
                            ORDER BY status, start_of_period
                            UNION ALL
                            SELECT
                                start_of_period, count(DISTINCT person_id) AS counts, status
                            FROM {events_query}
                            GROUP BY start_of_period, status
                        )
                        WHERE start_of_period <= {date_to_start_of_interval}
                            AND start_of_period >= {date_from_start_of_interval}
                        GROUP BY start_of_period, status
                        ORDER BY start_of_period ASC
                    )
                    GROUP BY status
                """,
                placeholders,
                timings=self.timings,
            )
        return lifecycle_query
    def to_actors_query(