2024-July-27 - 2.7.14830

Issue 12447 part2 (#12783)

* Reapply "Issues 12447 (Standardized Sorting of UnitCategory) (#12722)" (#12762)

This reverts commit e73fdec1d452793d89ffd8c8c1616ff6b286219f.

* Issue_12447_Part2 #1

PlayerUnitsPanel.java
- ensure uniqueness in returned list in method getAllUnitCategories
- reduce complexity by use of new method getProducibleUnitTypes
ProductionFrontier.java
- new method getProducibleUnitTypes