tp: cleanup diff test script in preperation for unified execution This CL does the following: 1. Makes all the actual running code use fully absolute paths so we can directly read the trace/query without needing to worry about relative paths. 2. Removes args as input which allows us to change args without affecting the running code. Change-Id: I3b7eec6bdc7d145cd8f3e6128f92628fc30ec57b
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