Python: Fix Cosmos DB for MongoDB vector index kind #29790

Job	Run time
paths-filter	7s
python-integration-tests-check	6s
Python Pre-Merge Integration Tests - Ollama	0s
Python Integration Tests - Scheduled run	0s
Python Pre-Merge Integration Tests - Memory (incl samples using those)	0s
Python Pre-Merge Integration Tests - AI Services (incl samples using those)	0s
Python Pre-Merge Integration Tests - Agents	0s
Python Pre-Merge Integration Tests - Multi-Modality	0s
	13s

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