[SONIC-SWSS] [DASH_APPLIANCE_TABLE] | syslog errors when applying DASH_APPLIANCE_TABLE config without "local_region_id" attribute

[ram25794]

local_region_id is an optional attribute in the DASH_APPLIANCE_TABLE config, so the case where local_region_id is not defined in the config should also be handled. Else we get the following log error.

2024 Nov  9 19:13:59.571705 sonic ERR syncd#syncd#SAI: :- sendApiResponse: api SAI_COMMON_API_CREATE failed in syncd mode: SAI_STATUS_NOT_IMPLEMENTED
2024 Nov  9 19:13:59.572190 sonic ERR swss#orchagent: :- create: create status: SAI_STATUS_NOT_IMPLEMENTED
2024 Nov  9 19:13:59.573071 sonic ERR syncd#syncd#SAI: :- processQuadEvent: attr: SAI_DASH_APPLIANCE_ATTR_LOCAL_REGION_ID: 0

"create_dash_appliance" method can be called only when "local_region_id" is configured - https://github.com/sonic-net/sonic-swss/blob/4eb74f0082f0f8c4537fe58621ac902c870d217c/orchagent/dash/dashorch.cpp#L106 to avoid the above mentioned log errors.

Issue is found on the latest Master branch.

Steps to Reproduce :

1. Load the switch the latest master image which doesn't support DASH_APPLIANCE_TABLE.
2. Apply DASH_APPLIANCE_TABLE config

[

{
        "DASH_APPLIANCE_TABLE:1": {
            "sip": "1.1.1.1", 
            "vm_vni": "1"
        },
        "OP": "SET"
    }

]

3. Log Error seen in syslog