.Net: Bug: Qdrant DateTime Range filter set incorrectly (#12936)

### Motivation and Context

Fixes #12934 

The filter translation layer set all 4 (Gt, Gte, Lt, Lte) properties of
the datetime range object, which resulted in always 0 results being
returned as no rows can be greater and smaller than the set date at the
same time.

### Description

At first I added some simple tests and an `DateTimeOffset` properties to
the unit tests, which failed. After debugging and finding the issue, I
made the changes and the tests passed.

I was only able to test the Qdrant and InMemory integrations though, due
to lack of locally running and preconfigured databases.

**Open**

### Contribution Checklist

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

- [x] The code builds clean without any errors or warnings
- [x] 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
- [x] All unit tests pass, and I have added new tests where possible
- [ ] I didn't break anyone 😄

Co-authored-by: TsengSR <kpgit@atomic-gear.net>

Author: TsengSR

dotnet/src/VectorData/Qdrant/QdrantFilterTranslator.cs

@@ -133,10 +133,10 @@ bool TryProcessComparison(Expression first, Expression second, [NotNullWhen(true
                             Key = property.StorageName,
                             DatetimeRange = new DatetimeRange
                             {
-                                Gt = Timestamp.FromDateTimeOffset(v),
-                                Gte = Timestamp.FromDateTimeOffset(v),
-                                Lt = Timestamp.FromDateTimeOffset(v),
-                                Lte = Timestamp.FromDateTimeOffset(v)
+                                Gt = comparison.NodeType == ExpressionType.GreaterThan ? Timestamp.FromDateTimeOffset(v) : null,
+                                Gte = comparison.NodeType == ExpressionType.GreaterThanOrEqual ? Timestamp.FromDateTimeOffset(v) : null,
+                                Lt = comparison.NodeType == ExpressionType.LessThan ? Timestamp.FromDateTimeOffset(v) : null,
+                                Lte = comparison.NodeType == ExpressionType.LessThanOrEqual ? Timestamp.FromDateTimeOffset(v) : null
                             }
                         },