feat(telemetry): instrument startup #2572

Job	Run time
Package	31s
Integration Test (Linux, VS Code 1.106.0)	1m 26s
Integration Test (Windows, VS Code stable)	2m 8s
Unit Test (Linux, Electron latest)	53s
Integration Test (macOS, VS Code stable)	1m 10s
Lint	1m 9s
Integration Test (Linux, VS Code stable)	41s
Unit Test (Linux, Electron 37)	57s
Unit Test (Windows, Electron latest)	2m 16s
Unit Test (macOS, Electron latest)	57s
	12m 8s

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