Changes for 0.8.9 (uamqp focus)

[digimaun]

• Increments version of uamqp to the one validated by CI
• Improves error feedback (actually showing what went wrong in stdout versus having to use --debug) from the out-of-band uamqp installation.
• CI improvements: Sets PYTHONPATH to the output of CLI core get_extension_path, increment MacOS image version, ensures junit_family setting of xunit1
• Misc test improvements
• Refactor unnecessary .get()'s from login validator

Note: There are some unrelated issues with pnp life cycle operations preventing complete test pass.

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Thank you for contributing to the IoT extension!

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General Guidelines

• If introducing new functionality or modified behavior, are they backed by unit and integration tests?
• In the same context as above are command names and their parameter definitions accurate? Do help docs have sufficient content?
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