Benchmark report: planning entity count should differentiate between movable and immovable planning entities

The benchmark report mentions the entity count, but it also counts the immovable planning entities.
With 40 movable entities and 60 immovable, it should show: "Planning entity count: 40 (plus 60 immovable)"
With 40 movable entities and 0 immovable, it should show: "Planning entity count: 40"
Similarly for planning variable count.

Pretty easy to fix, if you read these files:

benchmarkReport.html.ftl
ProblemBenchmarkResult.entityCount
EntityDescriptor.movableEntitySelectionFilter
get it from ScoreDirector.getSolutionDescriptor().findEntityDescriptor(...)

Probably easiest to try out with CurriculumCourseBenchmarkApp by using a dataset with a few Lecture.isLocked() set to true.