[ci] test collected binaries in kgraft case
[api] support maintenance incident request for kgraft case

Transfer channels and link targets to GM or incident projects.
This allows to build against former incidents or even GM version
for generating patches
[api] gitignore public/assets
[api] support submission of kgraft sources to code stream project

yes, ugly. this is what you get when a conceptional solution is required
the day before vacation ...