Fix behavior when missing Pip #1254

Job	Run time
Lint	1m 39s
Check Python types	3m 7s
Python Tests (ubuntu-latest, 3.8)	1m 43s
Python Tests (ubuntu-latest, 3.12)	1m 46s
Test Positron IPyKernel (macos-latest, 3.9)	2m 6s
Test Minimum Positron IPyKernel Dependencies (ubuntu-latest, 3.8)	4m 34s
Test Positron IPyKernel (windows-latest, 3.10)	8m 24s
Test Positron IPyKernel (ubuntu-latest, 3.11)	3m 5s
Test Positron IPyKernel (ubuntu-latest, 3.12)	2m 59s
Test TypeScript (ubuntu-latest, 3.x, ts-unit)	2m 54s
Test TypeScript (ubuntu-latest, 3.x, functional)	1m 55s
Test TypeScript (macos-latest, 3.x, ts-unit)	2m 49s
Test TypeScript (macos-latest, 3.x, venv)	3m 34s
Test TypeScript (macos-latest, 3.x, single-workspace)	3m 17s
Test TypeScript (macos-latest, 3.x, debugger)	2m 25s
Test TypeScript (macos-latest, 3.x, functional)	1m 27s
Test TypeScript (macos-latest, 3.x, smoke)	3m 43s
Test TypeScript (windows-latest, 3.x, ts-unit)	5m 50s
Test TypeScript (windows-latest, 3.x, functional)	4m 55s
	1h 2m 12s

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