Improved error validation for SagemakerEndpointEmbeddings embed_documents function

[kdassharma]

Description of changes:
I assume most people trialing this notebook won't have access to a ml.g5.24xlarge instance. I was trying with ml.m4.16xlarge with an consistently ran into issues like:

Error raised by inference endpoint: Read timeout on endpoint URL: 

Testing done:
Ran the embeddings with the updated embed_documents function and it works:

Processing chunks:  31%|█████████████████████████████▊                                                                  | 105/338 [41:19<1:26:51, 22.37s/it]
Error encountered while processing chunk requests[210:212] on retry 1: Error raised by inference endpoint: Read timeout on endpoint URL: "https://runtime.sagemaker.us-east-1.amazonaws.com/endpoints/jumpstart-example-raglc-huggingface-tex-2023-05-03-02-24-29-945/invocations"
Processing chunks:  94%|██████████████████████████████████████████████████████████████████████████████████████████▎     | 318/338 [2:04:16<07:20, 22.04s/it]

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