SPEC-2931 merges the qemux86-64 and intel builds into one.
Reflect this change in ci-management and move the intel build to replace qemux86-64 in the pipeline (CIB phase).
For CIBT phase, keep both CIBT-qemux86-64 and CIBT-intel-corei7-64 and adapt releng scripts for qemux86-64 to use the intel build artifacts.
We'll likely have to backport this to halibut (
|24263,1||WIP: SPEC-2962: permit to have more than one board per build||master||ci-management||Status: NEW||0||-1|