[issue38089] Make macOS tests optional on Azure Pipelines

[Steve Dower]

Change by Steve Dower <steve.dower at python.org>:


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keywords: +patch
pull_requests: +15500
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/15851

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38089>
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