### What this PR does / why we need it?
Removes the condition that skips metadata synchronization when
`enforce_eager` is enabled.
This change is necessary to correctly sync the `with_prefill` and
`enable_dbo` flags across all data parallel ranks, which is not required
in the base implementation. Forcing the sync operation prevents
potential inconsistencies, albeit with a minor performance impact.
### Does this PR introduce _any_ user-facing change?
None.
### How was this patch tested?
Add a E2E online test case?
- vLLM version: v0.10.1.1
- vLLM main:
e599e2c65e
Signed-off-by: Yizhou Liu <liu_yizhou@outlook.com>
c735bb0941