Order scatter plot data by usage instead of efficiency statistic.

[hltaylor26]

Description

The limit on the scatter plot stores is set to 3000. If there are more than 3000 data points, we want to prioritize showing users with the most usage on the system first. This change sets the order_by parameter to sort by the usage statistic descending.

I also disabled turboThreshold for the charts - https://api.highcharts.com/highcharts/plotOptions.series.turboThreshold. Having this enabled was causing the color coding of efficient vs inefficient points to not work as expected when the limit met the turboThreshold and there is no performance benefit for us having it enabled as the data being plotted does not fit into the following categories as taken from the Highcharts docs: "When a series contains a data array that is longer than this, only one dimensional arrays of numbers, or two dimensional arrays with x and y values are allowed."

Motivation and Context

Fixes issue: https://app.asana.com/0/1201929110850019/1202109495471984/f
This issue was found while testing for XSEDE10.0 release.

Tests performed

Changes were tested on my port on metrics-dev.
https://metrics-dev.ccr.buffalo.edu:9001/#main_tab_panel:efficiency

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project as found in the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.