[Container Registry] Test fixes

[seankane-msft]

Fixing the environment variables in tests to work with the pipeline.

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[ghost]

Hello @seankane-msft!

Because this pull request has the auto-merge label, I will be glad to assist with helping to merge this pull request once all check-in policies pass.

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[seankane-msft]

/check-enforcer reset

[seankane-msft]

/azp run python - containerregistry - ci

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).