Change tracking period of Delivered Quantified Savings KPI and increase target

Why is this change being made?

This MR is to change the Deliver Quantified Savings KPI to a rolling 12 month period and to increase the overall target.

The request to change to a rolling 12 month period is to be able to show a better picture of what procurement savings looks like throughout the year instead of seeing large fluctuations due to yearend.

The increase to the target, from $250,000 a quarter ($1M a year) to $3M a year is due to the success procurement has already achieved on this KPI, through negotiations and process improvement, so we feel we can raise the target.

Since this changes the definition of the KPI and the target, multiple approvals are required. The last person to approve is to merge.

Approvals Needed:

• @bryanwise
• @pmachle
• @sytses

cc @kathleentam @iweeks @a.hansen @wwright

Does this MR meet the acceptance criteria?

Conformity

• Added description to this MR explaining the reasons for the proposed change, per say-why-not-just-what