## 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
return inner._impl(*args, **kwargs)  
    def patch(wrapper):
        inner._impl = lambda *args, **kw: wrapper(fn, *args, **kw)  
    inner._impl = fn  
    inner._patch = patch  
    return inner
class PersonOnEventsMode(str, Enum):
    DISABLED = "disabled"
    V1_ENABLED = "v1_enabled"
    V2_ENABLED = "v2_enabled"
def label_for_team_id_to_track(team_id: int) -> str:
    team_id_filter: List[str] = settings.DECIDE_TRACK_TEAM_IDS
    team_id_as_string = str(team_id)
    if "all" in team_id_filter:
        return team_id_as_string
    if team_id_as_string in team_id_filter:
        return team_id_as_string
    team_id_ranges = [team_id_range for team_id_range in team_id_filter if ":" in team_id_range]
    for range in team_id_ranges:
        try:
            start, end = range.split(":")
            if int(start) <= team_id <= int(end):
                return team_id_as_string
        except Exception:
            pass
    return "unknown"