[hf-tei] add image uri to utils

[pagezyhf]

as per awslabs/llm-hosting-container#172

[mollyheamazon]

Please make sure to fix the unit tests

[cmanou]

@pagezyhf do you think you'll get a chance to add the tests for this soon? I am eagerly waiting for it to get merged. Otherwise I am happy to do a pr based off your branch with the tests looks like it just needs the 1.8.2 mapping added to here https://github.com/pagezyhf/sagemaker-python-sdk/blob/fe26625ba93866be89dfe4dc67b8350e0b3c6ceb/tests/unit/sagemaker/image_uris/test_huggingface_llm.py#L22-L37

[pagezyhf]

@pagezyhf do you think you'll get a chance to add the tests for this soon? I am eagerly waiting for it to get merged. Otherwise I am happy to do a pr based off your branch with the tests looks like it just needs the 1.8.2 mapping added to here https://github.com/pagezyhf/sagemaker-python-sdk/blob/fe26625ba93866be89dfe4dc67b8350e0b3c6ceb/tests/unit/sagemaker/image_uris/test_huggingface_llm.py#L22-L37

Should be good now!

[mollyheamazon]

Integ test failed with existing CI health issue not related to the changes in this commit. Will rerun the integ test and merge this as soon as the CI health issue is resolved.