.Net: Align Chroma memory store behavior with other stores (#2215)

### Motivation and Context

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This is an attempt to account for the [following
PR](#1989 (comment)).
Chroma logs an error when calling DoesCollectionExistAsync on a non
existing collection, it should log at debug level instead
Also Volatile Store and QDrant return an empty collection when calling
GetNearestMatchesAsync whereas Chroma throws an exception. This PR
aligns behavior with other stores.

### Description

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These notes will help understanding how your code works. Thanks! -->
Align chroma store behavior with other common memory stores


### Contribution Checklist

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- [ ] 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: Dmytro Struk <13853051+dmytrostruk@users.noreply.github.com>
Co-authored-by: Lee Miller <lemiller@microsoft.com>

Author: 3 people

dotnet/src/Connectors/Connectors.Memory.Chroma/ChromaMemoryStore.cs

@@ -252,7 +252,7 @@ await this.GetCollectionAsync(collectionName, cancellationToken).ConfigureAwait(
         }
         catch (SKException e) when (CollectionDoesNotExistException(e, collectionName))
         {
-            this._logger.LogError("Collection {0} does not exist", collectionName);
+            this._logger.LogDebug("Collection {0} does not exist", collectionName);
 
             return null;
         }