[ACR] Fix: various bug fixes

[mabenedi]

Related command
az acr manifest and az acr repository command groups

Description
3 bug fixes.

Testing Guide

History Notes

[ACR] Fix some az acr manifest commands do not correctly handle -u/-p credentials resulting in auth failure when not logged in to az cli
[ACR] Fix some az acr commands do not handle certain next-link tokens correctly resulting in exceptions when paging
[ACR] Fix some az acr manifest commands do not correctly parse some FQDNs resulting in exceptions

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[yonzhan]

acr

[wangzelin007]

/azp run

[azure-pipelines]

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