Upgrade the test suite

This MR updates the test suite syntax to require pytest >=3.9.3 (for the tmp_path fixture).

Add docstrings to all tests.

Address as much lint/technical debt as I could find.

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• 66df9e73 - Upgrade the test suite

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• 3ab97a11 - Upgrade the test suite

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• 3c3197e1 - Upgrade the test suite

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changed milestone to %GWDataFind Client 2.0.0

added apipatch continuous-integration labels

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• f6ecd7e6 - Upgrade the test suite

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• 42fb5535 - Upgrade the test suite

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• 5516adfe - Upgrade the test suite

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requested review from @duncan.meacher

approved this merge request

mentioned in commit 36cf1edb

merged