Display average/median for DORA4 in graphs

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Release notes

In this release, we have added the ability to view the average of your DORA4 metrics. This will allow you to continuously monitor your DevOps process and notice quickly how you are actually performing verse your average pace.

Problem to solve

As a user I want to be able to view the average per metric to measure myself against for each of the DORA4 metrics.

Proposal

Add a line to the graphs under CI/CD named DORA4 that displays the average/median

The average should eventually change based on the time interval that was selected, but as an MVC we can show a single average for the last 90 days without it dynamically changing when switching between time periods.

The average value should appear on the right hand side of the chart

Note:

For Deployment frequency we should show the average

For lead time for changes we should show the median

For consistency's sake