## 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/utils.py
columns = [col[0] for col in cursor.description]
    return [dict(zip(columns, row)) for row in cursor.fetchall()]
def convert_property_value(input: Union[str, bool, dict, list, int, Optional[str]]) -> str:
    if isinstance(input, bool):
        if input is True:
            return "true"
        return "false"
    if isinstance(input, dict) or isinstance(input, list):
        return json.dumps(input, sort_keys=True)
    return str(input)
def get_compare_period_dates(
    date_from: datetime.datetime,
    date_to: datetime.datetime,
    date_from_delta_mapping: Optional[Dict[str, int]],
    date_to_delta_mapping: Optional[Dict[str, int]],
    interval: str,
    ignore_date_from_alignment: bool = False,  
) -> Tuple[datetime.datetime, datetime.datetime]:
    diff = date_to - date_from
    new_date_from = date_from - diff
    if interval == "hour":
        
        
        new_date_from = new_date_from.replace(hour=date_from.hour, minute=0, second=0, microsecond=0)
        new_date_to = (new_date_from + diff).replace(minute=59, second=59, microsecond=999999)
    else: