Align vector-search-dotnet with TypeScript implementation

[Copilot]

Updates .NET vector search sample to use consistent Azure OpenAI API configuration with the TypeScript implementation.

Changes

• Azure OpenAI API version: 2024-08-01-preview → 2023-05-15 in appsettings.json

The following were already aligned:

• Embedding model: text-embedding-3-small
• Vector field name: DescriptionVector
• Data file: Hotels_Vector.json

Original prompt

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This section details on the original issue you should resolve

<issue_title>Update vector-search-dotnet application</issue_title>
<issue_description>Update the vector-search-dotnet-application to make the following details of the vector-search-typescript application. Don't change anything else. This will require changes to several file across the .NET samples. You need to find all the files and change them appropriately.

1. The embedded column name should be DescriptionVector
2. The embedding model should be text-embedding-3-small with api version 2023-05-15
3. The data file with the embeddings is Hotels_Vector.json</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Update vector-search-dotnet application #29

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