v9.0.0a2

[integration]

*WorkloadManagementSystem

FIX: (#7282) JobStatus: allow WAITING -> KILLED
FIX: (#7263) SiteDirector acts for a VO

*FrameworkSystem

FIX: (#7280) show status SysAdminCLI KeyError

*Resources

FIX: (#7279) getting more details about failed/aborted pilots from HTCondor

*Core

FIX: (#7273) createClient: also look at HandlerMixin classes to find export_ed functions. Fixes the client Documentation creation, fixes #7265

*WorkloadManagement

NEW: (#7271) SiteDirector - added preinstalledEnv and preinstalledEnvPrefix pilot options