[Logs UI] Hide anomalies histogram until we can implement swimlane viz to accommodate both anomaly types

[jasonrhodes]

As seen in #79763, the Logs UI's "Anomalies" tab has a histogram at the top of the screen that only shows Log rate anomalies. The table below has all anomalies across both types (log rate and categories). However, when there are critical category anomalies present in the table, they are not represented in the chart above.

This was done because the Y-axis for the chart won't make sense for both types of anomalies. The best fix for this is to move away from the histogram and to replace it with a swimlane visualization.

In the meantime, we should probably hide the chart altogether so that it doesn't mislead customers into thinking they have no anomalies when they in fact may have critical category anomalies.

[elasticmachine]

Pinging @elastic/logs-metrics-ui (Team:logs-metrics-ui)

[jasonrhodes]

@katrin-freihofner / @mukeshelastic can you weigh in here on this issue about whether you think the current implementation (which can be seen in the linked SDH) is a bug? If it is, we should hide it in 7.11 as a bug fix. Either way, we'll aim to get the swimlane in, as well.

[Kerry350]

Assigning to myself as this will close with #79763