Switch a portion of CI/packaging jobs to MacOS12#19908
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Description
Any pipeline that has a Mac leg to it is currently highly unstable and fails with very cryptic errors that is seemingly not task specific (see https://aiinfra.visualstudio.com/Lotus/_build/results?buildId=423158 for an example). Since many pipelines have multiple Mac job legs (since we support multiple Python versions), invariably one of those legs fails to make the entire pipeline red.
Moving a portion of the CI/packaging pipelines to MacOS 12 to study its stability for some time before switching all pipelines over completely if the experiment succeeds. The pipelines being moved over now are (iOS CI + iOS packaging + Mac CI + OrtTraining Mac CI + CoreML CI). Interestingly, the CoreML CI pipeline also uses agents from the same agent pool and it has 0 failures. Clearly, there is something (not in the CoreML pipeline) that triggers this instability on MacOS13. But it is very hard to spot the pattern. Moving over CoreML more for consistency sake.
Motivation and Context
Make several pipelines green again