[skip ci] Revert "[ci] Default to n=2 for test parallelism (#12376)" #12413
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This reverts commit 369e8b2.
There are certain tests that need to be serialized first (as in #8576) before this can merge or else failures like https://ci.tlcpack.ai/job/tvm/job/main/4040/display/redirect will happen based on which tests happen to be run together or not
cc @Mousius @areusch @gigiblender