feat(telemetry): instrument startup #2571

Job	Run time
Lint	39s
Package	32s
Unit Test (macOS, Electron latest)	1m 26s
Unit Test (Linux, Electron 37)	1m 2s
Unit Test (Linux, Electron latest)	59s
Integration Test (Windows, VS Code stable)	2m 4s
Integration Test (macOS, VS Code stable)	1m 15s
Integration Test (Linux, VS Code stable)	46s
Integration Test (Linux, VS Code 1.106.0)	54s
Unit Test (Windows, Electron latest)	1m 58s
	11m 35s

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