Default integration test configs to allow negative decimal scale [databricks] #4812
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This changes the integration test setup to always request support for negative decimal scales by default. If desired, tests could still override this by specifying a conf that explicitly sets the config to disallow it. This reduces a lot of boilerplate on tests that have been copied throughout.
A reusable conf for enabling ANSI was also added to reduce the test boilerplate for this conf which appears in a number of places.