rename extname for idx #32305

Job	Run time
check-json-schema (20)	2m 2s
check-package-lock-vsce (20)	9s
check-package-lock (20)	26s
lint	0s
vscode_integration (18)	9m 16s
vscode_unit (18)	6m 19s
unit (18)	4m 28s
vscode_integration (20)	8m 55s
vscode_unit (20)	5m 46s
unit (20)	4m 59s
integration (20, npm run test:client-integration)	2m 48s
integration-windows (20, npm run test:hosting)	9m 12s
integration (20, npm run test:emulator)	3m 20s
integration-windows (20, npm run test:client-integration)	5m 30s
integration (20, npm run test:extensions-emulator)	3m 24s
integration-windows (20, npm run test:emulator)	6m 23s
integration (20, npm run test:frameworks)	4m 43s
integration (20, npm run test:functions-discover)	3m 29s
integration-windows (20, npm run test:functions-discover)	9m 46s
integration (20, npm run test:hosting)	3m 12s
integration-windows (20, npm run test:triggers-end-to-end:inspect)	9m 12s
integration (20, npm run test:import-export)	3m 42s
integration-windows (20, npm run test:storage-deploy)	8m 17s
integration (20, npm run test:storage-deploy)	2m 46s
integration-windows (20, npm run test:frameworks)	10m 40s
integration (20, npm run test:storage-emulator-integration)	5m 9s
integration (20, npm run test:triggers-end-to-end)	5m 27s
integration (20, npm run test:triggers-end-to-end:inspect)	3m 19s
integration (20, npm run test:dataconnect-deploy)	12m 53s
integration (20, npm run test:dataconnect-emulator)	2m 20s
	2h 37m 52s

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