test: Add comprehensive test coverage for QdrantObjectFactory
and QdrantVectorStore.Builder
#4051
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Changes
QdrantObjectFactory: Added 5 tests covering empty maps, primitive types, unset values, null input validation, and mixed data types
QdrantVectorStore.Builder: Added 7 tests covering dependency preservation, configuration immutability, null handling, build-time validation, strategy retention, collection name edge cases, and builder pattern integrity
Key Improvements
Better error handling validation with proper exception testing
Edge case coverage for boundary conditions (empty inputs, single characters, numeric names)
Type safety verification (protobuf long vs int handling)
Builder pattern compliance testing
Increases test reliability and prevents potential runtime issues in production.