Get context errors before tearing down test

[iso88592]

On non-self test failures ducktape fails with `AttributeError: 'TestContext' object has no attribute 'services''

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[iso88592]

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[ewencp]

Sorry, missed this PR. Can you explain what non-self test failures are and why this is the right solution? the services attribute should be instantiated when the TestContext is initialized and wouldn't be cleared after that afaict.

Alternatively, how would we validate the updated behavior with a test?

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