[Timeseries, Graph]: Last period of data is cropped in panel

### What happened? _I've already opened the issue here https://github.com/grafana/grafana/issues/40766 but then forgot about it. So created this one with reproducible panel data bellow._ We're displaying time series data in graph panel. As you can see in the screenshot below there are 5m periods of data. However, the last period is somehow cropped.  Those are 5m periods. If I pick time range 00:00:00-00:19:59 I expect to see 4 "equally" wide sectors. But I see 3 300-second wide + 1 one-second wide The range in the screenshot is sth like 22:00:00-22:29:59 but I don't see anything between 22:25:01-22:29:59  ### What did you expect to happen? I'd expect to see the whole last bar and not just it's border. ### Did this work before? Nope ### How do we reproduce it? See bellow ### Is the bug inside a dashboard panel? | Key | Value | |--|--| | Panel | timeseries @ 10.2.0-pre (358a05e6a85) | | Grafana | 10.2.0-pre (358a05e6a85) // Open Source | <details><summary>Panel debug snapshot dashboard</summary> ```json { "panels": [ { "datasource": { "type": "grafana", "uid": "grafana" }, "fieldConfig": { "defaults": { "custom": { "drawStyle": "line", "lineInterpolation": "stepAfter", "barAlignment": 0, "lineWidth": 1, "fillOpacity": 80, "gradientMode": "none", "spanNulls": false, "insertNulls": false, "showPoints": "never", "pointSize": 1, "stacking": { "mode": "normal", "group": "A" }, "axisPlacement": "auto", "axisLabel": "", "axisColorMode": "text", "axisShow": false, "scaleDistrib…