Fix notebook path completions root folder (#6018) #1253

Job	Run time
Check Python types	3m 13s
Test Positron IPyKernel (macos-latest, 3.9)	2m 37s
Lint	3m 57s
Test Positron IPyKernel (windows-latest, 3.10)	5m 22s
Test Minimum Positron IPyKernel Dependencies (ubuntu-latest, 3.8)	4m 30s
Python Tests (ubuntu-latest, 3.8)	1m 45s
Test Positron IPyKernel (ubuntu-latest, 3.11)	2m 54s
Test TypeScript (ubuntu-latest, 3.x, ts-unit)	3m 41s
Test Positron IPyKernel (ubuntu-latest, 3.12)	3m 23s
Python Tests (ubuntu-latest, 3.12)	1m 39s
Test TypeScript (ubuntu-latest, 3.x, functional)	4m 39s
Test TypeScript (macos-latest, 3.x, ts-unit)	3m 13s
Test TypeScript (macos-latest, 3.x, venv)	4m 17s
Test TypeScript (macos-latest, 3.x, single-workspace)	3m 0s
Test TypeScript (macos-latest, 3.x, debugger)	4m 27s
Test TypeScript (macos-latest, 3.x, functional)	2m 15s
Test TypeScript (macos-latest, 3.x, smoke)	3m 37s
Test TypeScript (windows-latest, 3.x, ts-unit)	6m 31s
Test TypeScript (windows-latest, 3.x, functional)	5m 29s
	1h 10m 29s

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