Use `pytorch-stonepia` folder as a root folder for building proxy pytorch #5998

Job	Run time
Prepare	1s
Prepare	1s
Pre-commit checks	2m 49s
Pre-commit checks	2m 49s
Integration tests matrix (3.9, lts) / Integration tests	4m 34s
Integration tests matrix (3.9, lts) / Integration tests	39m 47s
Integration tests matrix (3.9, rolling) / Integration tests	4m 51s
Integration tests matrix (3.9, rolling) / Integration tests	43m 26s
	1h 38m 18s

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