Added options for Linux to BuildAndTest and UE5 Horde templates for ShooterGame/QAGame for completeness.
#jira nojira
#rb swarm
#review-15847237 @jeff.farris, @yuriy.odonnell
[CL 15848178 by Andrew Grant in ue5-main branch]
Cleaned up some options around paths to make it easier for scripts to customize them.
Fixed issue with GDKBuilds in Gauntlet where the build source was ignoring the specified recursion depth when searching
#jira nojira
#rb jeff.farris
[CL 15780860 by Andrew Grant in ue5-main branch]