Remove code that depends on six package from our libraries

[xiangyan99]

Now we still have some libraries that have code dependency on six.

Let's take some time to update the code to be py3 only.

Here is the list of the packages: azure-ai-anomalydetector azure-appconfiguration - auto-gened code azure-security-attestation azure-ai-language-questionanswering azure-communication azure-containerregistry - test only azure-cosmos azure-eventgrid azure-eventhub azure-ai-ml azure-monitor azure-search-documents azure-storage azure-data-tables azure-ai-translation-document azure-media-videoanalyzer-edge

[azure-sdk]

Label prediction was below confidence level 0.6 for Model:ServiceLabels: 'Docs:0.15871936,Azure.Identity:0.10427446,Tables:0.10258443'

[xiangyan99]

Dup of #26895