Cause: The timesync role is replacing the default `OPTIONS=` setting for chronyd with `""` upon every role run.

Consequence: This removes the default `OPTIONS="-F 2"` setting on EL9 and EL10 which weakens the security of chronyd.

Fix: Add `-F 2` as the default setting for `OPTIONS` in EL9 and EL10. Ensure that the user can override this setting if necessary, and ensure that this setting can co-exist with other `OPTIONS` settings that may be set by the user.

Result: The timesync role applies the correct security settings on every platform and allows the user to override/extend these settings.

Fixes #278