[MEDI] Remove default storage names from IngestionChunkVectorRecord

[Copilot]

• Remove EmbeddingStorageName const from VectorStoreExtensions.cs
• Remove StorageName = EmbeddingStorageName from VectorStoreVectorProperty in GetIngestionRecordCollection
• Remove storage name constants and StorageName from all attributes in IngestionChunkVectorRecord.cs
• Update template file IngestedChunk.cs to remove StorageName = EmbeddingStorageName
• Update README.md example to use [VectorStoreVector(1536)] (simplified, no DistanceFunction)
• Update test helper TestChunkRecordWithMetadata to remove StorageName = EmbeddingStorageName
• Update all 5 template snapshot files to remove StorageName = EmbeddingStorageName
• Build and verify all tests pass

Original prompt

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This section details on the original issue you should resolve

<issue_title>[MEDI] Don't provide default storage names</issue_title>
<issue_description>Context: https://github.com/dotnet/extensions/pull/7396/changes#r2974517352

Remove following usages:

extensions/src/Libraries/Microsoft.Extensions.DataIngestion/Writers/VectorStoreExtensions.cs

Line 15 in 0d663b3

internal const string EmbeddingStorageName = "embedding";

extensions/src/Libraries/Microsoft.Extensions.DataIngestion/Writers/VectorStoreExtensions.cs

Line 89 in 0d663b3

StorageName = EmbeddingStorageName,

extensions/src/Libraries/Microsoft.Extensions.DataIngestion/Writers/IngestionChunkVectorRecord.cs

Lines 22 to 30 in 0d663b3

	/// <summary>
	/// The storage name for the <see cref="Embedding"/> property.
	/// </summary>
	protected const string EmbeddingStorageName = VectorStoreExtensions.EmbeddingStorageName;
	private const string KeyStorageName = "key";
	private const string DocumentIdStorageName = "documentid";
	private const string ContentStorageName = "content";
	private const string ContextStorageName = "context";

Don't set the StorageName property for any of the attributes here:

extensions/src/Libraries/Microsoft.Extensions.DataIngestion/Writers/IngestionChunkVectorRecord.cs

Line 35 in 0d663b3

[VectorStoreKey(StorageName = KeyStorageName)]

Do KEEP following usages to show it can be customized:

extensions/test/Libraries/Microsoft.Extensions.DataIngestion.Tests/Writers/VectorStoreWriterTests.cs

Lines 30 to 41 in 0d663b3

	new VectorStoreKeyProperty(nameof(IngestionChunkVectorRecord<>.Key), typeof(Guid)) { StorageName = "custom_key" },
	new VectorStoreVectorProperty(nameof(IngestionChunkVectorRecord<>.Embedding), typeof(string), TestEmbeddingGenerator<string>.DimensionCount)
	{
	StorageName = "custom_embedding",
	},
	new VectorStoreDataProperty(nameof(IngestionChunkVectorRecord<>.Content), typeof(string)) { StorageName = "custom_content" },
	new VectorStoreDataProperty(nameof(IngestionChunkVectorRecord<>.Context), typeof(string)) { StorageName = "custom_context" },
	new VectorStoreDataProperty(nameof(IngestionChunkVectorRecord<>.DocumentId), typeof(string))
	{
	StorageName = "custom_documentid",
	IsIndexed = true,
	},

cc @roji</issue_description>

<agent_instructions>Study issue description, ensure the repo builds and tests are green after your changes. Don't forget to update template files as well (sample)</agent_instructions>

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

• Fixes [MEDI] Don't provide default storage names #7425

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Microsoft Reviewers: Open in CodeFlow

[adamsitnik]

@copilot address my feedback and see what we needed to do in #7396 for file in src/ProjectTemplates/Microsoft.Extensions.AI.Templates/* in order to ensure we don't break template tests. Then do the corresponding changes here.

[Copilot]

@copilot address my feedback and see what we needed to do in #7396 for file in src/ProjectTemplates/Microsoft.Extensions.AI.Templates/* in order to ensure we...

Done in 5c7335d — updated all 5 IngestedChunk.cs snapshot files under test/ProjectTemplates/Microsoft.Extensions.AI.Templates.IntegrationTests/Snapshots/ to remove StorageName = EmbeddingStorageName, matching the template source change.