[cmake][bugfix] Use install(PROGRAMS...) signature to install executable scripts

CMake does not preserve file permissions when installing files. In order to get executable scripts installed, the install(PROGRAMS...) signature needs to be used instead of install(FILES...).

merged

mentioned in commit cc5ed571

mentioned in commit e1c92f23

mentioned in merge request !814 (merged)

mentioned in commit 20a8172d

mentioned in commit 50072bcb

mentioned in merge request !828 (merged)

mentioned in commit 04878200