fix(analytics-chart): render timeseries charts with a single point [MA-2682]

[ryanmoore]

Summary

When a line chart is asked to display a single data point, display that datapoint with a radius smaller than the hover radius instead of displaying a deceptive "No data" error.

Test dataset:

{
  "data": [
    {
      "event": {
        "request_count": 100000
      },
      "timestamp": "2024-12-23T07:00:00.000Z"
    }
  ],
  "meta": {
    "start_ms": 1734937200000,
    "end_ms": 1735023600000,
    "limit": 50,
    "granularity_ms": 86400000,
    "metric_names": [
      "request_count"
    ],
    "truncated": false,
    "display": {},
    "metric_units": {
      "request_count": "count"
    }
  }
}

Before:

After:

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[ryanmoore]

reworking based on feedback from @filipgutica