[P/D][main]Offline the llmdatadist connector related parts of the code and files. (#4780)

### What this PR does / why we need it?
As support for the mooncake connector is now available, the llmdatadist
connector is no longer being maintained, so the llmdatadist-related
files need to be retired.

### Does this PR introduce _any_ user-facing change?
No

### How was this patch tested?
By ci

- vLLM version: v0.12.0
- vLLM main:
ad32e3e19c

---------

Signed-off-by: wangxiaoteng <wangxiaoteng@huawei.com>
Signed-off-by: liziyu <liziyu16@huawei.com>
Co-authored-by: liziyu <liziyu16@huawei.com>

vllm_ascend/distributed/__init__.py

@@ -20,11 +20,6 @@ from vllm.distributed.kv_transfer.kv_connector.factory import \
 
 
 def register_connector():
-    KVConnectorFactory.register_connector(
-        "LLMDataDistCMgrConnector",
-        "vllm_ascend.distributed.llmdatadist_c_mgr_connector",
-        "LLMDataDistCMgrConnector")
-
     KVConnectorFactory.register_connector(
         "MooncakeConnectorV1", "vllm_ascend.distributed.mooncake_connector",
         "MooncakeConnector")