## 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
if self.query.samplingFactor == 0:
            counts_with_sampling = ast.Constant(value=0)
        elif self.query.samplingFactor is not None and self.query.samplingFactor != 1:
            counts_with_sampling = parse_expr(
                "round(counts * (1 / {sampling_factor}))",
                {
                    "sampling_factor": ast.Constant(value=self.query.samplingFactor),
                },
            )
        else:
            counts_with_sampling = parse_expr("counts")
        placeholders = {
            **self.query_date_range.to_placeholders(),
            "events_query": self.events_query,
            "periods_query": self.periods_query,
            "counts_with_sampling": counts_with_sampling,
        }
        with self.timings.measure("lifecycle_query"):
            lifecycle_query = parse_select(
                """
                    SELECT groupArray(start_of_period) AS date,
                           groupArray({counts_with_sampling}) AS total,
                           status
                    FROM (
                        SELECT
                            status = 'dormant' ? negate(sum(counts)) : negate(negate(sum(counts))) as counts,
                            start_of_period,
                            status