[MacPorts] #64180: Remove azure pipelines

[MacPorts]

#64180: Remove azure pipelines
----------------------------+---------------------
 Reporter:  ryandesign      |      Owner:  admin@…
     Type:  defect          |     Status:  new
 Priority:  Normal          |  Milestone:
Component:  server/hosting  |    Version:
 Keywords:                  |       Port:
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 Per Azure:

 > The macOS-10.14 environment is deprecated and will be removed on
 December 10, 2021. For more details see
 https://devblogs.microsoft.com/devops/hosted-pipelines-image-deprecation/

 We use GitHub Actions for macOS 10.15 and later, so we no longer have any
 need for Azure Pipelines and everything related to it can be deleted from
 MacPorts.

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Ticket URL: <https://trac.macports.org/ticket/64180>
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