.Net: Update SK to use MEVD packages and move MEVD projects out of main solution #29820

Job	Run time
paths-filter	7s
python-integration-tests-check	6s
Python Pre-Merge Integration Tests - AI Services (incl samples using those)	-1s
Python Integration Tests - Scheduled run	-1s
Python Pre-Merge Integration Tests - Ollama	-1s
Python Pre-Merge Integration Tests - Agents	-1s
Python Pre-Merge Integration Tests - Memory (incl samples using those)	-1s
Python Pre-Merge Integration Tests - Multi-Modality	-1s
	7s

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