Extend kickstart `repodetect.sh` for EL10 repositories

[silug]

Summary

simp-utils kickstart repo detection script only handles EL7/EL8.

Findings

• Script docs and logic constrain supported versions to 7 and 8.
• No case branch exists for version 10.

Evidence

• simp-utils/share/ks/CentOS/repodetect.sh:11
• simp-utils/share/ks/CentOS/repodetect.sh:62
• simp-utils/share/ks/CentOS/repodetect.sh:87

Impact

Kickstart/bootstrap paths that call this script can fail on EL10 due to missing generated repo definitions.

Proposed Fix

Add version-10 branches and repo mappings for supported EL10 distros.

Definition of Done

repodetect.sh 10 ... produces valid repo entries and succeeds in EL10 install/bootstrap tests.