Fix reading `JUPYTER_RUNTIME_DIR` and `XDG_RUNTIME_DIR` (#16451) #17664

Job	Run time
Build VSIX	1m 20s
Lint	2m 1s
cancel_previous_runs	6s
Type Script Tests (ubuntu-latest, ts-unit)	1m 28s
Type Script Tests (windows-latest, ts-unit)	6m 3s
Tests (raw, python, 3.10, ^[^@]+$\|@mandatory\|@kernelCore\|@python\|@jupyter, ubuntu-latest)	6m 2s
Tests (raw, python, 3.10, @widgets, ubuntu-latest)	4m 54s
Tests (raw, python, 3.10, @iw, ubuntu-latest)	3m 53s
Tests (raw, python, 3.10, @webview\|@export\|@lsp\|@variableViewer, ubuntu-latest)	4m 26s
Tests (raw, python, 3.10, @debugger, ubuntu-latest)	3m 34s
Tests (remote, python, 3.10, ^[^@]+$\|@mandatory, ubuntu-latest)	4m 0s
Tests (web, python, 3.10, ^[^@]+$\|@mandatory, ubuntu-latest)	2m 57s
Tests (raw, python, 3.10, ^[^@]+$\|@mandatory, windows-latest)	6m 19s
Tests (raw, python, 3.10, @widgets, ubuntu-latest, 8)	4m 45s
Tests (remote, python, 3.10, @widgets, ubuntu-latest, 8)	5m 22s
Tests (raw, conda, 3.10, ^[^@]+$\|@mandatory\|@python, ubuntu-latest)	3m 51s
Tests (raw, noPython, @nonPython, ubuntu-latest)	2m 6s
Tests (remote, python, 3.10, @kernelCore, ubuntu-latest)	4m 6s
Smoke tests (ubuntu-latest, 3.10)	2m 40s
Smoke tests (windows-latest, 3.10)	3m 16s
Smoke tests (macos-latest, 3.10)	1m 52s
	1h 15m 1s

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