Sync feature not handling non-existing local routes present remotely

[Vits-99]

Sync feature is not functioning correctly when local routes do not exist but are present remotely.

Steps to Reproduce:

1. In Pinecone, define the following routes:

    ("politics", "isn't politics the best thing ever")
    ("politics", "why don't you tell me about your political opinions")

2. Locally, define the following route:

    chitchat = Route(
        name="chitchat",
        utterances=[
            "how's the weather today?",
            "how's the weather today my super duper dear?",
            "how are things going?",
            "how are you doing today?"
        ],
    )
    
    routes = [chitchat]
    
    encoder = ...
    pc_index = PineconeIndex(
        ...
        sync="merge-force-local"
    )
    
    rl = RouteLayer(encoder=encoder, routes=routes, index=pc_index)
           print(rl("What do you think about the president?"))

Expected Behavior:
When using a politics input to layer we expect to get politics route correctly triggered.

Actual Behavior:
An error is returned indicating that no route with the name "politics" is found locally:
ERROR semantic_router.utils.logger No route found with name politics. Check to see if any Routes have been defined