Drop ADAL to unblock pipeline

[Hongyang Du (hond) (Danieladu)]

Fixes #minor

Description

ADAL library (Microsoft.IdentityModel.Clients.ActiveDirectory,Microsoft.Azure.Services.AppAuthentication ) has been marked deprecated and would block the Azure pipeline on 23 September.

Totally remove ADAL code to unblock the pipeline

[Hongyang Du (hond) (Danieladu)]

CI exception:

I think it make sense? Because we remove the ADAL code, which has been marked deprecate longlong ago.

[Joel Mut (sw-joelmut)]

Hi Hongyang Du (hond) (@Danieladu),

The changes are looking good! About the CI exception, this PR is introducing breaking changes.

tracyboehrer (@tracyboehrer), to merge this PR you'll need to exclude these classes from the compat check by adding them to the list in the ApiCompatExcludeClasses variable.

For more information, check out the PR #5124.

[Hongyang Du (hond) (Danieladu)]

I have updated the variable, but seems not work

Is there any additional thing should i do?

[Joel Mut (sw-joelmut)]

Hi Hongyang Du (hond) (@Danieladu),

We want to share our findings regarding the ApiCompatExcludeClasses variable.
The variable is working as expected, but you will need to execute the pipeline (new run, not retry) for the changes to be applied.

Additionally, there is another way of excluding the classes.
All compatibility issues shown in the Compatibility Check pipeline's section can be excluded by adding them to the ApiCompatBaseline.txt file.

[Hongyang Du (hond) (Danieladu)]

@microsoft/botframework-sdk tracyboehrer (@tracyboehrer) please help review this PR which blocks the SDK pipeline and also ABS pipeline.