remove legacy dataContext from Inspector #751

Job	Run time
⬢ Prepare Node.js	20s
🔍 Check if pull request	2s
🐍 Prepare Python	29s
🧱 Build test matrix	9s
🔍 Check	2m 53s
🧱 Build Spotlight	4m 14s
🗃 Build datasets	2m 4s
📝 Build API docs	46s
🧪 Doc Test	1m 13s
🧪 Unit Test	1m 31s
🔍 Check wheel contents	37s
🧪 Integration Test (ubuntu-latest, 3.8)	11m 15s
🧪 UI Test (chrome)	4m 47s
🧪 UI Test (firefox)	4m 29s
🚀 Release Spotlight	0s
	34m 49s

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