python: use Python Environment Tools for interpreter discovery #1196

Job	Run time
Check Python types	3m 5s
Create VSIX (ubuntu-latest, x86_64-unknown-linux-musl, linux-x64)	43s
Lint	1m 41s
Test Positron IPyKernel (macos-latest, 3.9)	2m 4s
Test Minimum Positron IPyKernel Dependencies (ubuntu-latest, 3.8)	3m 15s
Python Tests (ubuntu-latest, 3.8)	1m 56s
Test Positron IPyKernel (windows-latest, 3.10)	9m 44s
Python Tests (ubuntu-latest, 3.12)	1m 39s
Test Positron IPyKernel (ubuntu-latest, 3.11)	2m 47s
Test Positron IPyKernel (ubuntu-latest, 3.12)	2m 47s
Test TypeScript (ubuntu-latest, 3.x, ts-unit)	4m 20s
Test TypeScript (ubuntu-latest, 3.x, functional)	3m 16s
Test TypeScript (macos-latest, 3.x, ts-unit)	4m 46s
Test TypeScript (macos-latest, 3.x, venv)	4m 41s
Test TypeScript (macos-latest, 3.x, single-workspace)	6m 9s
Test TypeScript (macos-latest, 3.x, debugger)	3m 39s
Test TypeScript (macos-latest, 3.x, functional)	3m 19s
Test TypeScript (macos-latest, 3.x, smoke)	4m 7s
Test TypeScript (windows-latest, 3.x, ts-unit)	9m 36s
Test TypeScript (windows-latest, 3.x, functional)	9m 10s
Smoke tests	0s
	1h 22m 44s

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