Assign all unit tests using snake_oil_case_storage to same xdist thread #5390
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Issue
Several unit tests use snake_oil_case_storage that tries to cache the result of a snake_oil run. This cache is local to each xdist thread. Making sure that all unit tests using this pytest fixture run on the same thread will reduce the amount of times we need to run snake oil.
Approach
group all cases using snake_oil_case_storage in one xdist thread
Pre review checklist
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