MarsSeed  filed a deletion request for jdk-devel :
Orphaned package, last updated in 2018.
It was based on Oracle Java 11 Development Kit preview version.
According to a comment in 2019, since that time Oracle requires login to access insider builds.
There were no answers or newer comments since that time.
As I remember, Oracle kept only a very small subset of mostly legacy corporate addon technologies behind closed doors, and they abandoned new closed feature development on Java.
I think it's safe to delete this legacy package because it is defunct and there seems to be zero interest in it since 2019.
Request #34975 has been Accepted by Muflone :
[Autogenerated] Accepted deletion for jdk-devel.