graceful stop of pipeline jobs doesn't seem to work

when cancelling a yoctobuild job, bitbake is not stopped gracefully. This may lead to build errors when trying to run the job again.

Eg. this pipeline job (yoctobuild) was cancelled https://git.ostc-eu.org/oss-compliance/mirrors/oniro/-/jobs/86302

After that, the job was run against the same build dir, and bitbake failed to build all qemux86-64 images https://git.ostc-eu.org/oss-compliance/mirrors/oniro/-/jobs/86372

But in next pipelines, run against fresh build dirs (new commits), qemux86-64 builds worked, so errors were due to a non-graceful stop of bitbake