feat: add az CLI shim for Azure token acquisition via ado-codespaces-auth #157

Job	Run time
detect-changes	3s
test (artifacts-helper, mcr.microsoft.com/cbl-mariner/base/core:2.0)	42s
test (artifacts-helper, mcr.microsoft.com/devcontainers/base:ubuntu)	24s
test (artifacts-helper, mcr.microsoft.com/devcontainers/base:debian)	30s
test-scenarios (artifacts-helper)	13m 27s
	15m 6s

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