### Motivation and Context

This PR builds on microsoft#2435
- the previous PR updates azure-search to the latest package , where it
is recommended to use HnswVectorSearchAlgorithmConfiguration. The
previous implementation appears to be in a semi-deprecated state.

This new flow is the publicly recommended use for ACS according to
https://github.com/Azure/cognitive-search-vector-pr/tree/main/demo-python/code.

### Description
- update `azure-search-documents` dependency from `11.4.0b6 -> 11.4.0b8`
- index configuration changed from `VectorSearchAlgorithmConfiguration
-> HnswVectorSearchAlgorithmConfiguration`
- update `search_client.search()` call in `get_nearest_matches()` to be
consistent with the new index api

### Contribution Checklist

<!-- Before submitting this PR, please make sure: -->

- [ ] The code builds clean without any errors or warnings
- [ ] The PR follows the [SK Contribution
Guidelines](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md)
and the [pre-submission formatting
script](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md#development-scripts)
raises no violations
- [ ] All unit tests pass, and I have added new tests where possible
- [ ] I didn't break anyone 😄

---------

Co-authored-by: Kinfey <kinfeylo@microsoft.com>
Co-authored-by: Lee Miller <lemiller@microsoft.com>
Co-authored-by: Kinfey <93169410+kinfey@users.noreply.github.com>