Add CI configuration for RHDH release-1.10 branch

Add CI operator config and generated Prow jobs for the new
redhat-developer/rhdh release-1.10 branch. Based on the main branch
config with release-branch adaptations:

- Slack alerts channel: #rhdh-e2e-alerts-1-10
- Cron schedules on MON,WED,FRI, staggered from 00:00 UTC to avoid
  conflicts with release-1.9 on shared resources (GKE cluster,
  OSD-GCP quota, small OCP cluster pools)
- Cleanup jobs excluded (only run on main)
- max_concurrency set on all presubmit jobs

Assisted-by: OpenCode

Author: zdrapela