build

[Python] Fix relative paths on Windows PCs with multiple drives #18122

Job	Run time
cleanups	3s
lint	2m 18s
validate-python-codegen	11s
validate-generated-is-up-to-date	1m 16s
tests (macos-latest, terraform)	9m 22s
tests (windows-latest, direct)	6m 51s
tests (ubuntu-latest, direct)	3m 20s
tests (ubuntu-latest, terraform)	10m 6s
tests (macos-latest, direct)	5m 49s
tests (windows-latest, terraform)	18m 23s
	57m 39s

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