Allow sub-release names to sort on both release name and product name.

The issue was discussed with Aha Support under https://support.aha.io/hc/requests/357023

Useful to consumers of Release-related reports at all levels (including C-Suite).

Problem: We name all of our releases with just the release number (e.g. 2019.1 and 2018.3) the product name is what's different. Even though the sub-release names under Master Release are sorted alphabetically by release name this isn't much help since all of our Release names are identical.

Proposed Solution: Sort these sub-release names on both First = Release name and Second = Product name.