MovieScene was targeted as its headers were at the top of profiling ShooterGame builds.
Tested with -disableunity and -nopch. Current timings take ShooterGameEditor rebuild from 480s to 440s
#jira none
#rb josh.adams
#preflight 624c97a63661c8f04a191889
[CL 19634779 by christopher waters in ue5-main branch]