Reorder edsc python tests - NFC

    This CL orders the python tests to:
    1. allow introspecting on the EdscTest class and avoid the error-prone process of having to add the test call by hand;
    2. account for differences in the order of `dir(edscTest)` between python2, <= python3.5 and >= python 3.6

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PiperOrigin-RevId: 247609687