Cache case count when getting list of cases so query is executed once instead of three times

[mattwire]

Overview

Add caching for a case count query that is used on the case dashboard when listing cases.

Before

Cases are counted three times (query is run three times)

After

Cases are counted once (query is run once and then cached value is used).

Technical Details

Each time the function is called the query was executed. We add a static cache in the standard way so the query is only executed once.

Comments

@lcdservices Is this one you could review?

[lcdservices]

@mattwire I've tested and confirmed. I didn't add any debugging code to verify the query was only hit once. I just tested via the interface to confirm that the case list pulled consistently before and after applying the patch.

[seamuslee001]

Jenkins re test this please

[seamuslee001]

adding merge on pass based on Brian's review

[seamuslee001]

Merging as per the tag