Add 'hash_pathing_fallback' option, remove File.get_path() method (#1… #3341

Job	Run time
Build backend e2e test image	33s
lint_core	16s
Build frontend unit test image	27s
Build frontend e2e test image	36s
Lint mwdb-core web sources	43s
Build mwdb-core core image	1m 4s
Perform frontend unit tests	1m 3s
Build mwdb-core web image	22s
Perform frontend e2e tests	1m 54s
Perform backend e2e tests	3m 10s
Push images on Docker Hub	1m 14s
Push test images on Docker Hub	45s
	12m 7s

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