Add more test related to shell integration #7619

Job	Run time
Create VSIX	2m 41s
Lint	3m 15s
Coverage (ubuntu-latest)	12m 16s
Check Python types	2m 10s
Tests (ubuntu-latest, 3.x, ts-unit)	2m 41s
Tests (ubuntu-latest, 3.x, python-unit)	2m 51s
Tests (ubuntu-latest, 3.x, venv)	3m 5s
Tests (ubuntu-latest, 3.x, single-workspace)	2m 58s
Tests (ubuntu-latest, 3.x, debugger)	3m 5s
Tests (ubuntu-latest, 3.x, functional)	2m 24s
Tests (windows-latest, 3.x, ts-unit)	5m 37s
Tests (windows-latest, 3.x, python-unit)	4m 43s
Tests (windows-latest, 3.x, venv)	9m 29s
Tests (windows-latest, 3.x, single-workspace)	5m 0s
Tests (windows-latest, 3.x, debugger)	3m 53s
Tests (windows-latest, 3.x, functional)	6m 55s
Smoke tests (ubuntu-latest)	3m 22s
Smoke tests (windows-latest)	9m 14s
	1h 25m 39s

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