Ensure productivity analytics charts y-axis are integers

changelogs/unreleased/23140-productivity-analytics-limit-graph-scales-to-whole-numbers.yml

+---
+title: Limit productivity analytics graph y-axis scale to whole numbers
+merge_request: 23140
+author:
+type: fixed

ee/app/assets/javascripts/analytics/productivity_analytics/components/app.vue

@@ -112,6 +112,7 @@ export default {
           axisLabel: {
             formatter: value => value,
           },
+          minInterval: 1,
         },
         ...this.getColumnChartDatazoomOption(chartKey),
       };