MDEV-25280: cpack_rpm - MariaDB-client file moves

This fixes the MariaDB-client RPM to conflict with
< MariaDB-server-10.6 as a number of files where moved
from the server to client component.

see commits 09202b2e ->
 fa0ad2fb

cmake/cpack_rpm.cmake

@@ -152,6 +152,8 @@ SETA(CPACK_RPM_client_PACKAGE_OBSOLETES
 SETA(CPACK_RPM_client_PACKAGE_PROVIDES
   "MySQL-client"
   "mysql-client")
+SETA(CPACK_RPM_client_PACKAGE_CONFLICTS
+  "MariaDB-server < 10.6.0")
 
 SETA(CPACK_RPM_devel_PACKAGE_OBSOLETES
   "MySQL-devel")