denylist: remove root-reprovision.linear entry

md.linear was removed from the 6.8 kernel and as a result
we removed the test from FCOS and RHCOS in:
coreos#2830.
Remove the entry to clean up the denylist.

kola-denylist.yaml

@@ -13,12 +13,6 @@
     - azure
 - pattern: iso-offline-install-iscsi.bios
   tracker: https://github.com/coreos/fedora-coreos-tracker/issues/1638
-- pattern: ext.config.root-reprovision.linear
-  tracker: https://github.com/coreos/fedora-coreos-tracker/issues/1648
-  snooze: 2024-02-05
-  warn: true  
-  streams:
-    - rawhide
 - pattern: ext.config.files.console-config
   tracker: https://github.com/coreos/fedora-coreos-tracker/issues/1654
   streams: